18481536 has 96 divisors (see below), whose sum is σ = 54259920. Its totient is φ = 6036480.

The previous prime is 18481523. The next prime is 18481543. The reversal of 18481536 is 63518481.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a self number, because there is not a number n which added to its sum of digits gives 18481536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70141 + ... + 70403.

Almost surely, 2^18481536 is an apocalyptic number.

18481536 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 18481536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27129960).

18481536 is an abundant number, since it is smaller than the sum of its proper divisors (35778384).

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

18481536 is a wasteful number, since it uses less digits than its factorization.

18481536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 329 counting only the distinct ones).

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

The square root of 18481536 is about 4299.0157012972. The cubic root of 18481536 is about 264.3906063587.

The spelling of 18481536 in words is "eighteen million, four hundred eighty-one thousand, five hundred thirty-six".