138815524 has 27 divisors (see below), whose sum is σ = 250536657. Its totient is φ = 67298784.

The previous prime is 138815519. The next prime is 138815531. The reversal of 138815524 is 425518831.

The square root of 138815524 is 11782.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 81540900 + 57274624 = 9030^2 + 7568^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1013184 + ... + 1013320.

Almost surely, 2^138815524 is an apocalyptic number.

138815524 is the 11782-nd square number.

It is an amenable number.

138815524 is a deficient number, since it is larger than the sum of its proper divisors (111721133).

138815524 is an equidigital number, since it uses as much as digits as its factorization.

138815524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 182 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The cubic root of 138815524 is about 517.7808835585.

The spelling of 138815524 in words is "one hundred thirty-eight million, eight hundred fifteen thousand, five hundred twenty-four".