18923268 has 144 divisors (see below), whose sum is σ = 57716736. Its totient is φ = 4717440.

The previous prime is 18923257. The next prime is 18923291. The reversal of 18923268 is 86232981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 440055 + ... + 440097.

Almost surely, 2^18923268 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 18923268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28858368).

18923268 is an abundant number, since it is smaller than the sum of its proper divisors (38793468).

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

18923268 is a wasteful number, since it uses less digits than its factorization.

18923268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 99 counting only the distinct ones).

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

The square root of 18923268 is about 4350.0882749664. The cubic root of 18923268 is about 266.4804665437.

It can be divided in two parts, 18923 and 268, that added together give a palindrome (19191).

The spelling of 18923268 in words is "eighteen million, nine hundred twenty-three thousand, two hundred sixty-eight".