256400597 has 8 divisors (see below), whose sum is σ = 265001472. Its totient is φ = 247820400.

The previous prime is 256400587. The next prime is 256400609. The reversal of 256400597 is 795004652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256400597 - 2⁶ = 256400533 is a prime.

It is a super-2 number, since 2×256400597² = 131482532283912818, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256400597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256400587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22472 + ... + 31902.

It is an arithmetic number, because the mean of its divisors is an integer number (33125184).

Almost surely, 2^256400597 is an apocalyptic number.

It is an amenable number.

256400597 is a deficient number, since it is larger than the sum of its proper divisors (8600875).

256400597 is an equidigital number, since it uses as much as digits as its factorization.

256400597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10339.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 256400597 is about 16012.5137626795. The cubic root of 256400597 is about 635.2914503137.

The spelling of 256400597 in words is "two hundred fifty-six million, four hundred thousand, five hundred ninety-seven".