138331252 has 6 divisors (see below), whose sum is σ = 242079698. Its totient is φ = 69165624.

The previous prime is 138331243. The next prime is 138331273. The reversal of 138331252 is 252133831.

It can be written as a sum of positive squares in only one way, i.e., 117592336 + 20738916 = 10844^2 + 4554^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138331252.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 17291403 + ... + 17291410.

Almost surely, 2^138331252 is an apocalyptic number.

It is an amenable number.

138331252 is a deficient number, since it is larger than the sum of its proper divisors (103748446).

138331252 is a wasteful number, since it uses less digits than its factorization.

138331252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34582817 (or 34582815 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 138331252 is about 11761.4306952853. The cubic root of 138331252 is about 517.1780716913.

The spelling of 138331252 in words is "one hundred thirty-eight million, three hundred thirty-one thousand, two hundred fifty-two".