138871972 has 12 divisors (see below), whose sum is σ = 246653680. Its totient is φ = 68399496.

The previous prime is 138871949. The next prime is 138871973. The reversal of 138871972 is 279178831.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138871973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258822 + ... + 259357.

Almost surely, 2^138871972 is an apocalyptic number.

It is an amenable number.

138871972 is a deficient number, since it is larger than the sum of its proper divisors (107781708).

138871972 is a wasteful number, since it uses less digits than its factorization.

138871972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518250 (or 518248 counting only the distinct ones).

The product of its digits is 169344, while the sum is 46.

The square root of 138871972 is about 11784.3952751085. The cubic root of 138871972 is about 517.8510575891.

The spelling of 138871972 in words is "one hundred thirty-eight million, eight hundred seventy-one thousand, nine hundred seventy-two".