18139256 has 8 divisors (see below), whose sum is σ = 34011120. Its totient is φ = 9069624.

The previous prime is 18139237. The next prime is 18139267. The reversal of 18139256 is 65293181.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1133696 + ... + 1133711.

It is an arithmetic number, because the mean of its divisors is an integer number (4251390).

Almost surely, 2^18139256 is an apocalyptic number.

It is an amenable number.

18139256 is a deficient number, since it is larger than the sum of its proper divisors (15871864).

18139256 is a wasteful number, since it uses less digits than its factorization.

18139256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267413 (or 2267409 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 18139256 is about 4259.0205446793. The cubic root of 18139256 is about 262.7482446787.

The spelling of 18139256 in words is "eighteen million, one hundred thirty-nine thousand, two hundred fifty-six".