138868824 has 32 divisors (see below), whose sum is σ = 348286320. Its totient is φ = 46141056.

The previous prime is 138868813. The next prime is 138868841. The reversal of 138868824 is 428868831.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1519 + ... + 16734.

Almost surely, 2^138868824 is an apocalyptic number.

It is an amenable number.

138868824 is an abundant number, since it is smaller than the sum of its proper divisors (209417496).

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

138868824 is a wasteful number, since it uses less digits than its factorization.

138868824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18579 (or 18575 counting only the distinct ones).

The product of its digits is 589824, while the sum is 48.

The square root of 138868824 is about 11784.2617078882. The cubic root of 138868824 is about 517.8471446146.

The spelling of 138868824 in words is "one hundred thirty-eight million, eight hundred sixty-eight thousand, eight hundred twenty-four".