18121338 has 24 divisors (see below), whose sum is σ = 39468000. Its totient is φ = 6008904.

The previous prime is 18121297. The next prime is 18121351. The reversal of 18121338 is 83312181.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1053 + ... + 6111.

It is an arithmetic number, because the mean of its divisors is an integer number (1644500).

Almost surely, 2^18121338 is an apocalyptic number.

18121338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18121338 is an abundant number, since it is smaller than the sum of its proper divisors (21346662).

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

18121338 is a wasteful number, since it uses less digits than its factorization.

18121338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266 (or 5263 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 18121338 is about 4256.9164896671. The cubic root of 18121338 is about 262.6617017308.

The spelling of 18121338 in words is "eighteen million, one hundred twenty-one thousand, three hundred thirty-eight".