18669924 has 144 divisors (see below), whose sum is σ = 59928960. Its totient is φ = 4769280.

The previous prime is 18669907. The next prime is 18669943. The reversal of 18669924 is 42996681.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18669924.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 134247 + ... + 134385.

Almost surely, 2^18669924 is an apocalyptic number.

18669924 is a gapful number since it is divisible by the number (14) 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 18669924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29964480).

18669924 is an abundant number, since it is smaller than the sum of its proper divisors (41259036).

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

18669924 is a wasteful number, since it uses less digits than its factorization.

18669924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 205 counting only the distinct ones).

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

The square root of 18669924 is about 4320.8707455790. The cubic root of 18669924 is about 265.2859095286.

The spelling of 18669924 in words is "eighteen million, six hundred sixty-nine thousand, nine hundred twenty-four".