18461816 has 32 divisors (see below), whose sum is σ = 35973840. Its totient is φ = 8875008.

The previous prime is 18461809. The next prime is 18461831. The reversal of 18461816 is 61816481.

It is a happy number.

It is a congruent number.

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, 28391 + ... + 29033.

Almost surely, 2^18461816 is an apocalyptic number.

It is an amenable number.

18461816 is a deficient number, since it is larger than the sum of its proper divisors (17512024).

18461816 is a wasteful number, since it uses less digits than its factorization.

18461816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 779 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 18461816 is about 4296.7215408960. The cubic root of 18461816 is about 264.2965370085.

The spelling of 18461816 in words is "eighteen million, four hundred sixty-one thousand, eight hundred sixteen".