255705489 has 12 divisors (see below), whose sum is σ = 397764276. Its totient is φ = 157357152.

The previous prime is 255705451. The next prime is 255705493. The reversal of 255705489 is 984507552.

255705489 is a `hidden beast` number, since 25 + 570 + 54 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 149450625 + 106254864 = 12225^2 + 10308^2 .

It is not a de Polignac number, because 255705489 - 2⁷ = 255705361 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (255705419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1092642 + ... + 1092875.

It is an arithmetic number, because the mean of its divisors is an integer number (33147023).

Almost surely, 2^255705489 is an apocalyptic number.

It is an amenable number.

255705489 is a deficient number, since it is larger than the sum of its proper divisors (142058787).

255705489 is a wasteful number, since it uses less digits than its factorization.

255705489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185536 (or 2185533 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The square root of 255705489 is about 15990.7938827314. The cubic root of 255705489 is about 634.7168340870.

The spelling of 255705489 in words is "two hundred fifty-five million, seven hundred five thousand, four hundred eighty-nine".