138442732 has 12 divisors (see below), whose sum is σ = 248184216. Its totient is φ = 67532960.

The previous prime is 138442729. The next prime is 138442783. The reversal of 138442732 is 237244831.

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 in 3 ways as a sum of consecutive naturals, for example, 421918 + ... + 422245.

It is an arithmetic number, because the mean of its divisors is an integer number (20682018).

Almost surely, 2^138442732 is an apocalyptic number.

It is an amenable number.

138442732 is a deficient number, since it is larger than the sum of its proper divisors (109741484).

138442732 is a wasteful number, since it uses less digits than its factorization.

138442732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844208 (or 844206 counting only the distinct ones).

The product of its digits is 32256, while the sum is 34.

The square root of 138442732 is about 11766.1689602011. The cubic root of 138442732 is about 517.3169642159.

The spelling of 138442732 in words is "one hundred thirty-eight million, four hundred forty-two thousand, seven hundred thirty-two".