138942722 has 4 divisors (see below), whose sum is σ = 208414086. Its totient is φ = 69471360.

The previous prime is 138942719. The next prime is 138942731. The reversal of 138942722 is 227249831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 119924401 + 19018321 = 10951^2 + 4361^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34735679 + ... + 34735682.

Almost surely, 2^138942722 is an apocalyptic number.

138942722 is a deficient number, since it is larger than the sum of its proper divisors (69471364).

138942722 is an equidigital number, since it uses as much as digits as its factorization.

138942722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69471363.

The product of its digits is 48384, while the sum is 38.

The square root of 138942722 is about 11787.3967439804. The cubic root of 138942722 is about 517.9389844800.

The spelling of 138942722 in words is "one hundred thirty-eight million, nine hundred forty-two thousand, seven hundred twenty-two".