18139626 has 20 divisors (see below), whose sum is σ = 40646562. Its totient is φ = 6046488.

The previous prime is 18139613. The next prime is 18139633. The reversal of 18139626 is 62693181.

18139626 is a `hidden beast` number, since 18 + 13 + 9 + 626 = 666.

18139626 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 2099601 = 4005^2 + 1449^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 55825 + ... + 56148.

Almost surely, 2^18139626 is an apocalyptic number.

18139626 is an abundant number, since it is smaller than the sum of its proper divisors (22506936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18139626 is a wasteful number, since it uses less digits than its factorization.

18139626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111987 (or 111978 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 18139626 is about 4259.0639816748. The cubic root of 18139626 is about 262.7500311576.

The spelling of 18139626 in words is "eighteen million, one hundred thirty-nine thousand, six hundred twenty-six".