18051138 has 24 divisors (see below), whose sum is σ = 44698368. Its totient is φ = 5157432.

The previous prime is 18051119. The next prime is 18051139. The reversal of 18051138 is 83115081.

It is not an unprimeable number, because it can be changed into a prime (18051139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71506 + ... + 71757.

It is an arithmetic number, because the mean of its divisors is an integer number (1862432).

Almost surely, 2^18051138 is an apocalyptic number.

18051138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18051138 is an abundant number, since it is smaller than the sum of its proper divisors (26647230).

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

18051138 is a wasteful number, since it uses less digits than its factorization.

18051138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143278 (or 143275 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 18051138 is about 4248.6630838418. The cubic root of 18051138 is about 262.3220889707.

The spelling of 18051138 in words is "eighteen million, fifty-one thousand, one hundred thirty-eight".