138885722 has 8 divisors (see below), whose sum is σ = 208704276. Its totient is φ = 69317632.

The previous prime is 138885671. The next prime is 138885739. The reversal of 138885722 is 227588831.

It can be written as a sum of positive squares in 2 ways, for example, as 136632721 + 2253001 = 11689^2 + 1501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×138885722² = 38578487550922568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61223 + ... + 63450.

Almost surely, 2^138885722 is an apocalyptic number.

138885722 is a deficient number, since it is larger than the sum of its proper divisors (69818554).

138885722 is a wasteful number, since it uses less digits than its factorization.

138885722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125232.

The product of its digits is 215040, while the sum is 44.

The square root of 138885722 is about 11784.9786592934. The cubic root of 138885722 is about 517.8681481917.

The spelling of 138885722 in words is "one hundred thirty-eight million, eight hundred eighty-five thousand, seven hundred twenty-two".