256232409387 has 8 divisors (see below), whose sum is σ = 347433775680. Its totient is φ = 167926324680.

The previous prime is 256232409379. The next prime is 256232409427. The reversal of 256232409387 is 783904232652.

It is a happy number.

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

It is not a de Polignac number, because 256232409387 - 2³ = 256232409379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256232409347) 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, 723820189 + ... + 723820542.

It is an arithmetic number, because the mean of its divisors is an integer number (43429221960).

Almost surely, 2^256232409387 is an apocalyptic number.

256232409387 is a deficient number, since it is larger than the sum of its proper divisors (91201366293).

256232409387 is a wasteful number, since it uses less digits than its factorization.

256232409387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447640793.

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 256232409387 in words is "two hundred fifty-six billion, two hundred thirty-two million, four hundred nine thousand, three hundred eighty-seven".