256400523 has 12 divisors (see below), whose sum is σ = 371543640. Its totient is φ = 170385696.

The previous prime is 256400509. The next prime is 256400531. The reversal of 256400523 is 325004652.

256400523 is a `hidden beast` number, since 256 + 400 + 5 + 2 + 3 = 666.

256400523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256400523 - 2¹⁷ = 256269451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256400533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42693 + ... + 48326.

It is an arithmetic number, because the mean of its divisors is an integer number (30961970).

Almost surely, 2^256400523 is an apocalyptic number.

256400523 is a deficient number, since it is larger than the sum of its proper divisors (115143117).

256400523 is a wasteful number, since it uses less digits than its factorization.

256400523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91338 (or 91335 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 256400523 is about 16012.5114519865. The cubic root of 256400523 is about 635.2913891964.

The spelling of 256400523 in words is "two hundred fifty-six million, four hundred thousand, five hundred twenty-three".