256754409 has 8 divisors (see below), whose sum is σ = 346186080. Its totient is φ = 169246176.

The previous prime is 256754363. The next prime is 256754413. The reversal of 256754409 is 904457652.

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

It is not a de Polignac number, because 256754409 - 2⁸ = 256754153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256759409) 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, 480547 + ... + 481080.

It is an arithmetic number, because the mean of its divisors is an integer number (43273260).

Almost surely, 2^256754409 is an apocalyptic number.

It is an amenable number.

256754409 is a deficient number, since it is larger than the sum of its proper divisors (89431671).

256754409 is an equidigital number, since it uses as much as digits as its factorization.

256754409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961719.

The product of its (nonzero) digits is 302400, while the sum is 42.

The square root of 256754409 is about 16023.5579382358. The cubic root of 256754409 is about 635.5835328734.

The spelling of 256754409 in words is "two hundred fifty-six million, seven hundred fifty-four thousand, four hundred nine".