18681152 has 112 divisors (see below), whose sum is σ = 46329600. Its totient is φ = 7451136.

The previous prime is 18681139. The next prime is 18681167. The reversal of 18681152 is 25118681.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504878 + ... + 504914.

Almost surely, 2^18681152 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 18681152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23164800).

18681152 is an abundant number, since it is smaller than the sum of its proper divisors (27648448).

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

18681152 is an equidigital number, since it uses as much as digits as its factorization.

18681152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 69 counting only the distinct ones).

The product of its digits is 3840, while the sum is 32.

The square root of 18681152 is about 4322.1698254465. The cubic root of 18681152 is about 265.3390794162.

The spelling of 18681152 in words is "eighteen million, six hundred eighty-one thousand, one hundred fifty-two".