18316138 has 8 divisors (see below), whose sum is σ = 27850788. Its totient is φ = 9032544.

The previous prime is 18316127. The next prime is 18316141. The reversal of 18316138 is 83161381.

It can be written as a sum of positive squares in 2 ways, for example, as 18292729 + 23409 = 4277^2 + 153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18316138² = 670961822470088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62581 + ... + 62872.

Almost surely, 2^18316138 is an apocalyptic number.

18316138 is a deficient number, since it is larger than the sum of its proper divisors (9534650).

18316138 is a wasteful number, since it uses less digits than its factorization.

18316138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125528.

The product of its digits is 3456, while the sum is 31.

The square root of 18316138 is about 4279.7357395054. The cubic root of 18316138 is about 263.5995324831.

The spelling of 18316138 in words is "eighteen million, three hundred sixteen thousand, one hundred thirty-eight".