138012552 has 64 divisors (see below), whose sum is σ = 384633600. Its totient is φ = 45852480.

The previous prime is 138012547. The next prime is 138012557. The reversal of 138012552 is 255210831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138012547) and next prime (138012557).

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

It is not an unprimeable number, because it can be changed into a prime (138012557) 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 15 ways as a sum of consecutive naturals, for example, 78402 + ... + 80142.

It is an arithmetic number, because the mean of its divisors is an integer number (6009900).

Almost surely, 2^138012552 is an apocalyptic number.

138012552 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 138012552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192316800).

138012552 is an abundant number, since it is smaller than the sum of its proper divisors (246621048).

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

138012552 is a wasteful number, since it uses less digits than its factorization.

138012552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123 (or 2113 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 138012552 is about 11747.8743609216. The cubic root of 138012552 is about 516.7805924747.

The spelling of 138012552 in words is "one hundred thirty-eight million, twelve thousand, five hundred fifty-two".