18436736 has 16 divisors (see below), whose sum is σ = 36729690. Its totient is φ = 9218304.

The previous prime is 18436727. The next prime is 18436763. The reversal of 18436736 is 63763481.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 118336 = 4280^2 + 344^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 18436736.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71891 + ... + 72146.

Almost surely, 2^18436736 is an apocalyptic number.

18436736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18436736 is a deficient number, since it is larger than the sum of its proper divisors (18292954).

18436736 is an equidigital number, since it uses as much as digits as its factorization.

18436736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144051 (or 144039 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 18436736 is about 4293.8020448083. The cubic root of 18436736 is about 264.1768022905.

The spelling of 18436736 in words is "eighteen million, four hundred thirty-six thousand, seven hundred thirty-six".