18023136 has 48 divisors (see below), whose sum is σ = 47600784. Its totient is φ = 5970944.

The previous prime is 18023113. The next prime is 18023167. The reversal of 18023136 is 63132081.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18436 + ... + 19388.

It is an arithmetic number, because the mean of its divisors is an integer number (991683).

Almost surely, 2^18023136 is an apocalyptic number.

18023136 is a gapful number since it is divisible by the number (16) 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 18023136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23800392).

18023136 is an abundant number, since it is smaller than the sum of its proper divisors (29577648).

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

18023136 is a wasteful number, since it uses less digits than its factorization.

18023136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18023136 is about 4245.3664152815. The cubic root of 18023136 is about 262.1863755567.

The spelling of 18023136 in words is "eighteen million, twenty-three thousand, one hundred thirty-six".