18419664 has 60 divisors (see below), whose sum is σ = 50267616. Its totient is φ = 5811264.

The previous prime is 18419663. The next prime is 18419677. The reversal of 18419664 is 46691481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18419663) 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 11 ways as a sum of consecutive naturals, for example, 16797 + ... + 17859.

Almost surely, 2^18419664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18419664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25133808).

18419664 is an abundant number, since it is smaller than the sum of its proper divisors (31847952).

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

18419664 is a wasteful number, since it uses less digits than its factorization.

18419664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1087 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 18419664 is about 4291.8136026626. The cubic root of 18419664 is about 264.0952365305.

The spelling of 18419664 in words is "eighteen million, four hundred nineteen thousand, six hundred sixty-four".