138840824 has 8 divisors (see below), whose sum is σ = 260326560. Its totient is φ = 69420408.

The previous prime is 138840799. The next prime is 138840827. The reversal of 138840824 is 428048831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138840827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8677544 + ... + 8677559.

It is an arithmetic number, because the mean of its divisors is an integer number (32540820).

Almost surely, 2^138840824 is an apocalyptic number.

It is an amenable number.

138840824 is a deficient number, since it is larger than the sum of its proper divisors (121485736).

138840824 is a wasteful number, since it uses less digits than its factorization.

138840824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17355109 (or 17355105 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 138840824 is about 11783.0736227862. The cubic root of 138840824 is about 517.8123379190.

The spelling of 138840824 in words is "one hundred thirty-eight million, eight hundred forty thousand, eight hundred twenty-four".