18490815 has 64 divisors (see below), whose sum is σ = 39813120. Its totient is φ = 7948800.

The previous prime is 18490807. The next prime is 18490841. The reversal of 18490815 is 51809481.

It is not a de Polignac number, because 18490815 - 2³ = 18490807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18490815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15490 + ... + 16640.

It is an arithmetic number, because the mean of its divisors is an integer number (622080).

Almost surely, 2^18490815 is an apocalyptic number.

18490815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18490815 is an abundant number, since it is smaller than the sum of its proper divisors (21322305).

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

18490815 is a wasteful number, since it uses less digits than its factorization.

18490815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189 (or 1183 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18490815 is about 4300.0947663976. The cubic root of 18490815 is about 264.4348463681.

The spelling of 18490815 in words is "eighteen million, four hundred ninety thousand, eight hundred fifteen".