257965403 has 2 divisors, whose sum is σ = 257965404. Its totient is φ = 257965402.

The previous prime is 257965397. The next prime is 257965417. The reversal of 257965403 is 304569752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257965403 - 2⁴ = 257965387 is a prime.

It is a super-2 number, since 2×257965403² = 133092298289904818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257965483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128982701 + 128982702.

It is an arithmetic number, because the mean of its divisors is an integer number (128982702).

Almost surely, 2^257965403 is an apocalyptic number.

257965403 is a deficient number, since it is larger than the sum of its proper divisors (1).

257965403 is an equidigital number, since it uses as much as digits as its factorization.

257965403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 257965403 is about 16061.3014105333. The cubic root of 257965403 is about 636.5812189751.

The spelling of 257965403 in words is "two hundred fifty-seven million, nine hundred sixty-five thousand, four hundred three".