18938118 has 16 divisors (see below), whose sum is σ = 38128896. Its totient is φ = 6270600.

The previous prime is 18938107. The next prime is 18938123. The reversal of 18938118 is 81183981.

It is a nialpdrome in base 11.

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, 9546 + ... + 11357.

It is an arithmetic number, because the mean of its divisors is an integer number (2383056).

Almost surely, 2^18938118 is an apocalyptic number.

18938118 is an abundant number, since it is smaller than the sum of its proper divisors (19190778).

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

18938118 is a wasteful number, since it uses less digits than its factorization.

18938118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21059.

The product of its digits is 13824, while the sum is 39.

The square root of 18938118 is about 4351.7948021477. The cubic root of 18938118 is about 266.5501550041.

It can be divided in two parts, 1893 and 8118, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 18938118 in words is "eighteen million, nine hundred thirty-eight thousand, one hundred eighteen".