138955972 has 12 divisors (see below), whose sum is σ = 253745856. Its totient is φ = 66457160.

The previous prime is 138955969. The next prime is 138956029. The reversal of 138955972 is 279559831.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755104 + ... + 755287.

It is an arithmetic number, because the mean of its divisors is an integer number (21145488).

Almost surely, 2^138955972 is an apocalyptic number.

It is an amenable number.

138955972 is a deficient number, since it is larger than the sum of its proper divisors (114789884).

138955972 is a wasteful number, since it uses less digits than its factorization.

138955972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510418 (or 1510416 counting only the distinct ones).

The product of its digits is 680400, while the sum is 49.

The square root of 138955972 is about 11787.9587715601. The cubic root of 138955972 is about 517.9554480349.

The spelling of 138955972 in words is "one hundred thirty-eight million, nine hundred fifty-five thousand, nine hundred seventy-two".