138245972 has 24 divisors (see below), whose sum is σ = 258710760. Its totient is φ = 64409600.

The previous prime is 138245969. The next prime is 138245981. The reversal of 138245972 is 279542831.

It can be written as a sum of positive squares in 4 ways, for example, as 105596176 + 32649796 = 10276^2 + 5714^2 .

It is a super-2 number, since 2×138245972² = 38223897548449568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3197 + ... + 16932.

It is an arithmetic number, because the mean of its divisors is an integer number (10779615).

Almost surely, 2^138245972 is an apocalyptic number.

It is an amenable number.

138245972 is a deficient number, since it is larger than the sum of its proper divisors (120464788).

138245972 is a wasteful number, since it uses less digits than its factorization.

138245972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20251 (or 20249 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 138245972 is about 11757.8047270738. The cubic root of 138245972 is about 517.0717712666.

The spelling of 138245972 in words is "one hundred thirty-eight million, two hundred forty-five thousand, nine hundred seventy-two".