256893457 has 4 divisors (see below), whose sum is σ = 256982896. Its totient is φ = 256804020.

The previous prime is 256893449. The next prime is 256893473. The reversal of 256893457 is 754398652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256893457 - 2³ = 256893449 is a prime.

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 256893457.

It is not an unprimeable number, because it can be changed into a prime (256893437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40263 + ... + 46204.

It is an arithmetic number, because the mean of its divisors is an integer number (64245724).

Almost surely, 2^256893457 is an apocalyptic number.

It is an amenable number.

256893457 is a deficient number, since it is larger than the sum of its proper divisors (89439).

256893457 is an equidigital number, since it uses as much as digits as its factorization.

256893457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89438.

The product of its digits is 1814400, while the sum is 49.

The square root of 256893457 is about 16027.8962125414. The cubic root of 256893457 is about 635.6982477747.

The spelling of 256893457 in words is "two hundred fifty-six million, eight hundred ninety-three thousand, four hundred fifty-seven".