18375816 has 16 divisors (see below), whose sum is σ = 45939600. Its totient is φ = 6125264.

The previous prime is 18375809. The next prime is 18375857. The reversal of 18375816 is 61857381.

It is a super-2 number, since 2×18375816² = 675341227331712, 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, 382806 + ... + 382853.

It is an arithmetic number, because the mean of its divisors is an integer number (2871225).

Almost surely, 2^18375816 is an apocalyptic number.

It is an amenable number.

18375816 is an abundant number, since it is smaller than the sum of its proper divisors (27563784).

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

18375816 is a wasteful number, since it uses less digits than its factorization.

18375816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765668 (or 765664 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 18375816 is about 4286.7022289868. The cubic root of 18375816 is about 263.8855105032.

It can be divided in two parts, 18375 and 816, that added together give a palindrome (19191).

The spelling of 18375816 in words is "eighteen million, three hundred seventy-five thousand, eight hundred sixteen".