138343452 has 48 divisors (see below), whose sum is σ = 358858752. Its totient is φ = 41192640.

The previous prime is 138343451. The next prime is 138343453. The reversal of 138343452 is 254343831.

138343452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138343451) and next prime (138343453).

It is a super-2 number, since 2×138343452² = 38277821422552608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138343451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9468 + ... + 19139.

It is an arithmetic number, because the mean of its divisors is an integer number (7476224).

Almost surely, 2^138343452 is an apocalyptic number.

138343452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138343452 is an abundant number, since it is smaller than the sum of its proper divisors (220515300).

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

138343452 is a wasteful number, since it uses less digits than its factorization.

138343452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28658 (or 28656 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 138343452 is about 11761.9493282364. The cubic root of 138343452 is about 517.1932752622.

The spelling of 138343452 in words is "one hundred thirty-eight million, three hundred forty-three thousand, four hundred fifty-two".