18210132 has 72 divisors (see below), whose sum is σ = 49212800. Its totient is φ = 5660928.

The previous prime is 18210119. The next prime is 18210139. The reversal of 18210132 is 23101281.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18210139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53868 + ... + 54204.

Almost surely, 2^18210132 is an apocalyptic number.

18210132 is a gapful number since it is divisible by the number (12) 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 18210132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24606400).

18210132 is an abundant number, since it is smaller than the sum of its proper divisors (31002668).

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

18210132 is a wasteful number, since it uses less digits than its factorization.

18210132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18210132 is about 4267.3331250325. Note that the first 3 decimals coincide. The cubic root of 18210132 is about 263.0900143433.

The spelling of 18210132 in words is "eighteen million, two hundred ten thousand, one hundred thirty-two".