256139350 has 12 divisors (see below), whose sum is σ = 476419284. Its totient is φ = 102455720.

The previous prime is 256139321. The next prime is 256139363. The reversal of 256139350 is 53931652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2561344 + ... + 2561443.

It is an arithmetic number, because the mean of its divisors is an integer number (39701607).

Almost surely, 2^256139350 is an apocalyptic number.

256139350 is a deficient number, since it is larger than the sum of its proper divisors (220279934).

256139350 is a wasteful number, since it uses less digits than its factorization.

256139350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5122799 (or 5122794 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 256139350 is about 16004.3540950580. The cubic root of 256139350 is about 635.0756104812.

The spelling of 256139350 in words is "two hundred fifty-six million, one hundred thirty-nine thousand, three hundred fifty".