18535138 has 16 divisors (see below), whose sum is σ = 28558080. Its totient is φ = 9019296.

The previous prime is 18535133. The next prime is 18535183. The reversal of 18535138 is 83153581.

It is not an unprimeable number, because it can be changed into a prime (18535133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10731 + ... + 12337.

It is an arithmetic number, because the mean of its divisors is an integer number (1784880).

Almost surely, 2^18535138 is an apocalyptic number.

18535138 is a deficient number, since it is larger than the sum of its proper divisors (10022942).

18535138 is a wasteful number, since it uses less digits than its factorization.

18535138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761.

The product of its digits is 14400, while the sum is 34.

The square root of 18535138 is about 4305.2454053166. The cubic root of 18535138 is about 264.6459636773.

The spelling of 18535138 in words is "eighteen million, five hundred thirty-five thousand, one hundred thirty-eight".