18038520 has 96 divisors (see below), whose sum is σ = 59389200. Its totient is φ = 4747776.

The previous prime is 18038453. The next prime is 18038533. The reversal of 18038520 is 2583081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31759 + ... + 32321.

Almost surely, 2^18038520 is an apocalyptic number.

18038520 is a gapful number since it is divisible by the number (10) 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 18038520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29694600).

18038520 is an abundant number, since it is smaller than the sum of its proper divisors (41350680).

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

18038520 is a wasteful number, since it uses less digits than its factorization.

18038520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18038520 is about 4247.1778865501. The cubic root of 18038520 is about 262.2609524437.

The spelling of 18038520 in words is "eighteen million, thirty-eight thousand, five hundred twenty".