138422916 has 36 divisors (see below), whose sum is σ = 361970700. Its totient is φ = 44549568.

The previous prime is 138422903. The next prime is 138422939. The reversal of 138422916 is 619224831.

It can be written as a sum of positive squares in 2 ways, for example, as 76737600 + 61685316 = 8760^2 + 7854^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 in 11 ways as a sum of consecutive naturals, for example, 65251 + ... + 67338.

Almost surely, 2^138422916 is an apocalyptic number.

It is an amenable number.

138422916 is an abundant number, since it is smaller than the sum of its proper divisors (223547784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138422916 is a wasteful number, since it uses less digits than its factorization.

138422916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132628 (or 132623 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 138422916 is about 11765.3268547882. The cubic root of 138422916 is about 517.2922809842.

The spelling of 138422916 in words is "one hundred thirty-eight million, four hundred twenty-two thousand, nine hundred sixteen".