18438154 has 16 divisors (see below), whose sum is σ = 31824000. Its totient is φ = 7848144.

The previous prime is 18438143. The next prime is 18438163. The reversal of 18438154 is 45183481.

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, 2334 + ... + 6505.

It is an arithmetic number, because the mean of its divisors is an integer number (1989000).

Almost surely, 2^18438154 is an apocalyptic number.

18438154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18438154 is a deficient number, since it is larger than the sum of its proper divisors (13385846).

18438154 is a wasteful number, since it uses less digits than its factorization.

18438154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8997.

The product of its digits is 15360, while the sum is 34.

The square root of 18438154 is about 4293.9671633584. The cubic root of 18438154 is about 264.1835748758.

The spelling of 18438154 in words is "eighteen million, four hundred thirty-eight thousand, one hundred fifty-four".