18807816 has 32 divisors (see below), whose sum is σ = 47491200. Its totient is φ = 6206400.

The previous prime is 18807781. The next prime is 18807821. The reversal of 18807816 is 61870881.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 1456 + ... + 6303.

It is an arithmetic number, because the mean of its divisors is an integer number (1484100).

Almost surely, 2^18807816 is an apocalyptic number.

It is an amenable number.

18807816 is an abundant number, since it is smaller than the sum of its proper divisors (28683384).

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

18807816 is a wasteful number, since it uses less digits than its factorization.

18807816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7869 (or 7865 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 18807816 is about 4336.7978970665. The cubic root of 18807816 is about 265.9374228586.

The spelling of 18807816 in words is "eighteen million, eight hundred seven thousand, eight hundred sixteen".