138644522 has 4 divisors (see below), whose sum is σ = 207966786. Its totient is φ = 69322260.

The previous prime is 138644509. The next prime is 138644531. The reversal of 138644522 is 225446831.

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., 85951441 + 52693081 = 9271^2 + 7259^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34661129 + ... + 34661132.

Almost surely, 2^138644522 is an apocalyptic number.

138644522 is a deficient number, since it is larger than the sum of its proper divisors (69322264).

138644522 is an equidigital number, since it uses as much as digits as its factorization.

138644522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69322263.

The product of its digits is 46080, while the sum is 35.

The square root of 138644522 is about 11774.7408464051. The cubic root of 138644522 is about 517.5681841281.

The spelling of 138644522 in words is "one hundred thirty-eight million, six hundred forty-four thousand, five hundred twenty-two".