138878524 has 24 divisors (see below), whose sum is σ = 259078400. Its totient is φ = 64949040.

The previous prime is 138878473. The next prime is 138878533. The reversal of 138878524 is 425878831.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5562 + ... + 17569.

Almost surely, 2^138878524 is an apocalyptic number.

It is an amenable number.

138878524 is a deficient number, since it is larger than the sum of its proper divisors (120199876).

138878524 is a wasteful number, since it uses less digits than its factorization.

138878524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23233 (or 23231 counting only the distinct ones).

The product of its digits is 430080, while the sum is 46.

The square root of 138878524 is about 11784.6732665781. The cubic root of 138878524 is about 517.8592015573.

The spelling of 138878524 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, five hundred twenty-four".