138132639 has 6 divisors (see below), whose sum is σ = 199524936. Its totient is φ = 92088420.

The previous prime is 138132637. The next prime is 138132677. The reversal of 138132639 is 936231831.

138132639 is a `hidden beast` number, since 1 + 3 + 8 + 13 + 2 + 639 = 666.

It is not a de Polignac number, because 138132639 - 2¹ = 138132637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138132637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7674027 + ... + 7674044.

It is an arithmetic number, because the mean of its divisors is an integer number (33254156).

Almost surely, 2^138132639 is an apocalyptic number.

138132639 is a deficient number, since it is larger than the sum of its proper divisors (61392297).

138132639 is a wasteful number, since it uses less digits than its factorization.

138132639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15348077 (or 15348074 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 138132639 is about 11752.9842593275. The cubic root of 138132639 is about 516.9304354646.

The spelling of 138132639 in words is "one hundred thirty-eight million, one hundred thirty-two thousand, six hundred thirty-nine".