18446816 has 24 divisors (see below), whose sum is σ = 36781920. Its totient is φ = 9105408.

The previous prime is 18446801. The next prime is 18446821. The reversal of 18446816 is 61864481.

It is a self number, because there is not a number n which added to its sum of digits gives 18446816.

It is a congruent number.

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, 1121 + ... + 6176.

It is an arithmetic number, because the mean of its divisors is an integer number (1532580).

Almost surely, 2^18446816 is an apocalyptic number.

18446816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18446816 is a deficient number, since it is larger than the sum of its proper divisors (18335104).

18446816 is an equidigital number, since it uses as much as digits as its factorization.

18446816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7386 (or 7378 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18446816 is about 4294.9756693141. The cubic root of 18446816 is about 264.2249383780.

The spelling of 18446816 in words is "eighteen million, four hundred forty-six thousand, eight hundred sixteen".