18664992 has 120 divisors (see below), whose sum is σ = 57934800. Its totient is φ = 5878656.

The previous prime is 18664981. The next prime is 18664993. The reversal of 18664992 is 29946681.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18664993) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49059 + ... + 49437.

It is an arithmetic number, because the mean of its divisors is an integer number (482790).

Almost surely, 2^18664992 is an apocalyptic number.

18664992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18664992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28967400).

18664992 is an abundant number, since it is smaller than the sum of its proper divisors (39269808).

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

18664992 is a wasteful number, since it uses less digits than its factorization.

18664992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 403 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18664992 is about 4320.2999895841. The cubic root of 18664992 is about 265.2625474386.

The spelling of 18664992 in words is "eighteen million, six hundred sixty-four thousand, nine hundred ninety-two".