138432252 has 72 divisors (see below), whose sum is σ = 395552640. Its totient is φ = 37467360.

The previous prime is 138432211. The next prime is 138432269. The reversal of 138432252 is 252234831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4977 + ... + 17367.

Almost surely, 2^138432252 is an apocalyptic number.

138432252 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 138432252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197776320).

138432252 is an abundant number, since it is smaller than the sum of its proper divisors (257120388).

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

138432252 is a wasteful number, since it uses less digits than its factorization.

138432252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12431 (or 12422 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 138432252 is about 11765.7236071565. The cubic root of 138432252 is about 517.3039103981.

The spelling of 138432252 in words is "one hundred thirty-eight million, four hundred thirty-two thousand, two hundred fifty-two".