138216824 has 8 divisors (see below), whose sum is σ = 259156560. Its totient is φ = 69108408.

The previous prime is 138216803. The next prime is 138216839. The reversal of 138216824 is 428612831.

138216824 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8638544 + ... + 8638559.

It is an arithmetic number, because the mean of its divisors is an integer number (32394570).

Almost surely, 2^138216824 is an apocalyptic number.

It is an amenable number.

138216824 is a deficient number, since it is larger than the sum of its proper divisors (120939736).

138216824 is a wasteful number, since it uses less digits than its factorization.

138216824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17277109 (or 17277105 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 138216824 is about 11756.5651446330. The cubic root of 138216824 is about 517.0354286349.

The spelling of 138216824 in words is "one hundred thirty-eight million, two hundred sixteen thousand, eight hundred twenty-four".