18701816 has 32 divisors (see below), whose sum is σ = 40214880. Its totient is φ = 7987200.

The previous prime is 18701791. The next prime is 18701827. The reversal of 18701816 is 61810781.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

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, 28856 + ... + 29496.

It is an arithmetic number, because the mean of its divisors is an integer number (1256715).

Almost surely, 2^18701816 is an apocalyptic number.

It is an amenable number.

18701816 is an abundant number, since it is smaller than the sum of its proper divisors (21513064).

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

18701816 is a wasteful number, since it uses less digits than its factorization.

18701816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175 (or 1171 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 18701816 is about 4324.5596307601. The cubic root of 18701816 is about 265.4368775665.

The spelling of 18701816 in words is "eighteen million, seven hundred one thousand, eight hundred sixteen".