138572122 has 16 divisors (see below), whose sum is σ = 224690760. Its totient is φ = 63715392.

The previous prime is 138572089. The next prime is 138572123. The reversal of 138572122 is 221275831.

It can be written as a sum of positive squares in 4 ways, for example, as 16491721 + 122080401 = 4061^2 + 11049^2 .

It is not an unprimeable number, because it can be changed into a prime (138572123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2913 + ... + 16900.

Almost surely, 2^138572122 is an apocalyptic number.

138572122 is a deficient number, since it is larger than the sum of its proper divisors (86118638).

138572122 is a wasteful number, since it uses less digits than its factorization.

138572122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20097.

The product of its digits is 6720, while the sum is 31.

The square root of 138572122 is about 11771.6660672991. Note that the first 3 decimals coincide. The cubic root of 138572122 is about 517.4780772839.

The spelling of 138572122 in words is "one hundred thirty-eight million, five hundred seventy-two thousand, one hundred twenty-two".