257504407 has 2 divisors, whose sum is σ = 257504408. Its totient is φ = 257504406.

The previous prime is 257504393. The next prime is 257504417. The reversal of 257504407 is 704405752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257504407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257504417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128752203 + 128752204.

It is an arithmetic number, because the mean of its divisors is an integer number (128752204).

Almost surely, 2^257504407 is an apocalyptic number.

257504407 is a deficient number, since it is larger than the sum of its proper divisors (1).

257504407 is an equidigital number, since it uses as much as digits as its factorization.

257504407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 257504407 is about 16046.9438523352. The cubic root of 257504407 is about 636.2017929286.

The spelling of 257504407 in words is "two hundred fifty-seven million, five hundred four thousand, four hundred seven".