18533808 has 120 divisors (see below), whose sum is σ = 56233008. Its totient is φ = 5677056.

The previous prime is 18533807. The next prime is 18533821. The reversal of 18533808 is 80833581.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18533807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163960 + ... + 164072.

Almost surely, 2^18533808 is an apocalyptic number.

18533808 is a gapful number since it is divisible by the number (18) 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 18533808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28116504).

18533808 is an abundant number, since it is smaller than the sum of its proper divisors (37699200).

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

18533808 is a wasteful number, since it uses less digits than its factorization.

18533808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 18533808 is about 4305.0909398060. The cubic root of 18533808 is about 264.6396335823.

The spelling of 18533808 in words is "eighteen million, five hundred thirty-three thousand, eight hundred eight".