257485907 has 16 divisors (see below), whose sum is σ = 304361472. Its totient is φ = 213161760.

The previous prime is 257485903. The next prime is 257485909. The reversal of 257485907 is 709584752.

It is a happy number.

It is not a de Polignac number, because 257485907 - 2² = 257485903 is a prime.

It is a super-2 number, since 2×257485907² = 132597984607225298, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (257485903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160433 + ... + 162029.

It is an arithmetic number, because the mean of its divisors is an integer number (19022592).

Almost surely, 2^257485907 is an apocalyptic number.

257485907 is a deficient number, since it is larger than the sum of its proper divisors (46875565).

257485907 is a wasteful number, since it uses less digits than its factorization.

257485907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378.

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 257485907 is about 16046.3674082329. The cubic root of 257485907 is about 636.1865569239.

The spelling of 257485907 in words is "two hundred fifty-seven million, four hundred eighty-five thousand, nine hundred seven".