257441407 has 4 divisors (see below), whose sum is σ = 257759656. Its totient is φ = 257123160.

The previous prime is 257441383. The next prime is 257441477. The reversal of 257441407 is 704144752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257441407 - 2²⁷ = 123223679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257441477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157908 + ... + 159529.

It is an arithmetic number, because the mean of its divisors is an integer number (64439914).

Almost surely, 2^257441407 is an apocalyptic number.

257441407 is a deficient number, since it is larger than the sum of its proper divisors (318249).

257441407 is an equidigital number, since it uses as much as digits as its factorization.

257441407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318248.

The product of its (nonzero) digits is 31360, while the sum is 34.

The square root of 257441407 is about 16044.9807416525. The cubic root of 257441407 is about 636.1499051667.

The spelling of 257441407 in words is "two hundred fifty-seven million, four hundred forty-one thousand, four hundred seven".