18431252 has 36 divisors (see below), whose sum is σ = 37767744. Its totient is φ = 7847280.

The previous prime is 18431251. The next prime is 18431279. The reversal of 18431252 is 25213481.

It is a super-2 number, since 2×18431252² = 679422100575008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18431251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52943 + ... + 53289.

It is an arithmetic number, because the mean of its divisors is an integer number (1049104).

Almost surely, 2^18431252 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 18431252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18883872).

18431252 is an abundant number, since it is smaller than the sum of its proper divisors (19336492).

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

18431252 is a wasteful number, since it uses less digits than its factorization.

18431252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 627 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 18431252 is about 4293.1634024342. The cubic root of 18431252 is about 264.1506065971.

The spelling of 18431252 in words is "eighteen million, four hundred thirty-one thousand, two hundred fifty-two".