18139056 has 80 divisors (see below), whose sum is σ = 51767520. Its totient is φ = 5437440.

The previous prime is 18139031. The next prime is 18139073. The reversal of 18139056 is 65093181.

It is a super-2 number, since 2×18139056² = 658050705142272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25230 + ... + 25938.

It is an arithmetic number, because the mean of its divisors is an integer number (647094).

Almost surely, 2^18139056 is an apocalyptic number.

18139056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18139056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25883760).

18139056 is an abundant number, since it is smaller than the sum of its proper divisors (33628464).

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

18139056 is a wasteful number, since it uses less digits than its factorization.

18139056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 18139056 is about 4258.9970650377. The cubic root of 18139056 is about 262.7472790044.

The spelling of 18139056 in words is "eighteen million, one hundred thirty-nine thousand, fifty-six".