18736816 has 30 divisors (see below), whose sum is σ = 42231300. Its totient is φ = 8029728.

The previous prime is 18736787. The next prime is 18736819. The reversal of 18736816 is 61863781.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18736819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11166 + ... + 12733.

It is an arithmetic number, because the mean of its divisors is an integer number (1407710).

Almost surely, 2^18736816 is an apocalyptic number.

18736816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18736816 is an abundant number, since it is smaller than the sum of its proper divisors (23494484).

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

18736816 is a wasteful number, since it uses less digits than its factorization.

18736816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23921 (or 23908 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 18736816 is about 4328.6043940282. The cubic root of 18736816 is about 265.6023606264.

The spelling of 18736816 in words is "eighteen million, seven hundred thirty-six thousand, eight hundred sixteen".