138389522 has 4 divisors (see below), whose sum is σ = 207584286. Its totient is φ = 69194760.

The previous prime is 138389513. The next prime is 138389527. The reversal of 138389522 is 225983831.

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., 81522841 + 56866681 = 9029^2 + 7541^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138389522.

It is not an unprimeable number, because it can be changed into a prime (138389527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34597379 + ... + 34597382.

Almost surely, 2^138389522 is an apocalyptic number.

138389522 is a deficient number, since it is larger than the sum of its proper divisors (69194764).

138389522 is an equidigital number, since it uses as much as digits as its factorization.

138389522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69194763.

The product of its digits is 103680, while the sum is 41.

The square root of 138389522 is about 11763.9075990931. The cubic root of 138389522 is about 517.2506793760.

The spelling of 138389522 in words is "one hundred thirty-eight million, three hundred eighty-nine thousand, five hundred twenty-two".