138547972 has 12 divisors (see below), whose sum is σ = 244204240. Its totient is φ = 68775336.

The previous prime is 138547957. The next prime is 138547973. The reversal of 138547972 is 279745831.

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 (138547973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124038 + ... + 125149.

Almost surely, 2^138547972 is an apocalyptic number.

It is an amenable number.

138547972 is a deficient number, since it is larger than the sum of its proper divisors (105656268).

138547972 is a wasteful number, since it uses less digits than its factorization.

138547972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249330 (or 249328 counting only the distinct ones).

The product of its digits is 423360, while the sum is 46.

The square root of 138547972 is about 11770.6402544636. The cubic root of 138547972 is about 517.4480139459.

The spelling of 138547972 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred seventy-two".