18039132 has 96 divisors (see below), whose sum is σ = 50400000. Its totient is φ = 5562432.

The previous prime is 18039127. The next prime is 18039149. The reversal of 18039132 is 23193081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18039096 and 18039105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120994 + ... + 121142.

It is an arithmetic number, because the mean of its divisors is an integer number (525000).

Almost surely, 2^18039132 is an apocalyptic number.

18039132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

18039132 is the 2124-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18039132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25200000).

18039132 is an abundant number, since it is smaller than the sum of its proper divisors (32360868).

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

18039132 is a wasteful number, since it uses less digits than its factorization.

18039132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 18039132 is about 4247.2499337807. The cubic root of 18039132 is about 262.2639183538.

The spelling of 18039132 in words is "eighteen million, thirty-nine thousand, one hundred thirty-two".