18959916 has 12 divisors (see below), whose sum is σ = 44239832. Its totient is φ = 6319968.

The previous prime is 18959869. The next prime is 18959977. The reversal of 18959916 is 61995981.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

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, 789985 + ... + 790008.

Almost surely, 2^18959916 is an apocalyptic number.

It is an amenable number.

18959916 is an abundant number, since it is smaller than the sum of its proper divisors (25279916).

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

18959916 is a wasteful number, since it uses less digits than its factorization.

18959916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580000 (or 1579998 counting only the distinct ones).

The product of its digits is 174960, while the sum is 48.

The square root of 18959916 is about 4354.2985657853. The cubic root of 18959916 is about 266.6523832627.

It can be divided in two parts, 1895 and 9916, that added together give a palindrome (11811).

The spelling of 18959916 in words is "eighteen million, nine hundred fifty-nine thousand, nine hundred sixteen".