256407438 has 16 divisors (see below), whose sum is σ = 586074240. Its totient is φ = 73259256.

The previous prime is 256407401. The next prime is 256407443. The reversal of 256407438 is 834704652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 256407396 and 256407405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3052428 + ... + 3052511.

It is an arithmetic number, because the mean of its divisors is an integer number (36629640).

Almost surely, 2^256407438 is an apocalyptic number.

256407438 is an abundant number, since it is smaller than the sum of its proper divisors (329666802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256407438 is a wasteful number, since it uses less digits than its factorization.

256407438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104951.

The product of its (nonzero) digits is 161280, while the sum is 39.

The square root of 256407438 is about 16012.7273754348. The cubic root of 256407438 is about 635.2971003138.

The spelling of 256407438 in words is "two hundred fifty-six million, four hundred seven thousand, four hundred thirty-eight".