402139256 has 32 divisors (see below), whose sum is σ = 798614400. Its totient is φ = 189306720.

The previous prime is 402139247. The next prime is 402139271. The reversal of 402139256 is 652931204.

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 7 ways as a sum of consecutive naturals, for example, 16661 + ... + 32891.

It is an arithmetic number, because the mean of its divisors is an integer number (24956700).

Almost surely, 2^402139256 is an apocalyptic number.

It is an amenable number.

402139256 is a deficient number, since it is larger than the sum of its proper divisors (396475144).

402139256 is a wasteful number, since it uses less digits than its factorization.

402139256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16419 (or 16415 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 402139256 is about 20053.4100840730. The cubic root of 402139256 is about 738.1174794557.

The spelling of 402139256 in words is "four hundred two million, one hundred thirty-nine thousand, two hundred fifty-six".