138533816 has 32 divisors (see below), whose sum is σ = 280895040. Its totient is φ = 63802368.

The previous prime is 138533803. The next prime is 138533821. The reversal of 138533816 is 618335831.

It is a self number, because there is not a number n which added to its sum of digits gives 138533816.

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, 4445 + ... + 17228.

It is an arithmetic number, because the mean of its divisors is an integer number (8777970).

Almost surely, 2^138533816 is an apocalyptic number.

It is an amenable number.

138533816 is an abundant number, since it is smaller than the sum of its proper divisors (142361224).

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

138533816 is a wasteful number, since it uses less digits than its factorization.

138533816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21743 (or 21739 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 138533816 is about 11770.0389124251. The cubic root of 138533816 is about 517.4303901018.

The spelling of 138533816 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, eight hundred sixteen".