18100138 has 32 divisors (see below), whose sum is σ = 33436800. Its totient is φ = 7171584.

The previous prime is 18100111. The next prime is 18100151. The reversal of 18100138 is 83100181.

It is a super-2 number, since 2×18100138² = 655229991238088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13398 + ... + 14686.

It is an arithmetic number, because the mean of its divisors is an integer number (1044900).

Almost surely, 2^18100138 is an apocalyptic number.

18100138 is a deficient number, since it is larger than the sum of its proper divisors (15336662).

18100138 is a wasteful number, since it uses less digits than its factorization.

18100138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 18100138 is about 4254.4256956727. The cubic root of 18100138 is about 262.5592331939.

The spelling of 18100138 in words is "eighteen million, one hundred thousand, one hundred thirty-eight".