18604816 has 40 divisors (see below), whose sum is σ = 37497600. Its totient is φ = 8935680.

The previous prime is 18604811. The next prime is 18604829. The reversal of 18604816 is 61840681.

It is a super-2 number, since 2×18604816² = 692278356787712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18604811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51645 + ... + 52003.

It is an arithmetic number, because the mean of its divisors is an integer number (937440).

Almost surely, 2^18604816 is an apocalyptic number.

18604816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18604816 is an abundant number, since it is smaller than the sum of its proper divisors (18892784).

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

18604816 is a wasteful number, since it uses less digits than its factorization.

18604816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18604816 is about 4313.3300360626. The cubic root of 18604816 is about 264.9771714048.

The spelling of 18604816 in words is "eighteen million, six hundred four thousand, eight hundred sixteen".