1130

1130 = 2 x 5 x 113. It is the product of three distinct Sophie Germain primes (A157346).

1130 is a Perrin number (A001608).

1130 is a number whose sum of digits is 5 (A052219). The sum of the digits of 1130 in base 2 (10001101010) is also 5 (A037308). It is a multiple of 5 with a digit sum of 5 (A069540).

Every base 6 digit of 1130 (5122) is a base 8 digit of 1130 (2152) (A037399).

1130 is the first of a pair of consecutive sphenic numbers (the product of three distinct primes) (A215217).

1130 has two representations as a sum of two squares: 1130 = 13² + 31² = 17² + 29².

1130 divides 69⁸ - 1.

Source: What's Special About This Number?

3480

3480 = 2 x 2 x 2 x 3 x 5 x 29.

3480 is a Perrin number (A001608).

3480 is 110110011000 in base 2 (binary). It is 2020 in base 12.

3480 is an octagonal pyramidal number (A002414).

3480 is the number of ways to place two nonattacking queens on an 10 x 10 board (A036464).

Source: What's Special About This Number?

644

644 = 2² x 7 x 23.

644 is a Perrin number.

644 is 212212 in base 3 and 2552 in base 6.

644 is a number made up of only semiprime digits (4, 6, and 9).

644 is the sum of five fourth powers: 644 = 5⁴ + 2⁴ + 1⁴ + 1⁴ + 1⁴.

The USS Lewis and Clark (SSBN-644) was a ballistic missile submarine in the U.S. Navy.

Source: What's Special About This Number?

486

486 = 2 x 3⁵.

486 is a Perrin number.

486 is 200000 in base 3 and 600 in base 9. It is 123 in base 21.

486 is a number with 12 divisors.

486 is the sum of two positive fifth powers: 486 = 3⁵ + 3⁵.

Intel's 486 (short for 80486) microprocessor chip powered many microcomputers, starting in 1986.

Source: What's Special About This Number?