138893816 has 8 divisors (see below), whose sum is σ = 260425920. Its totient is φ = 69446904.

The previous prime is 138893813. The next prime is 138893899. The reversal of 138893816 is 618398831.

It is a happy number.

138893816 is digitally balanced in base 2, 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 not an unprimeable number, because it can be changed into a prime (138893813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8680856 + ... + 8680871.

It is an arithmetic number, because the mean of its divisors is an integer number (32553240).

Almost surely, 2^138893816 is an apocalyptic number.

It is an amenable number.

138893816 is a deficient number, since it is larger than the sum of its proper divisors (121532104).

138893816 is a wasteful number, since it uses less digits than its factorization.

138893816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17361733 (or 17361729 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 138893816 is about 11785.3220575426. The cubic root of 138893816 is about 517.8782081252.

The spelling of 138893816 in words is "one hundred thirty-eight million, eight hundred ninety-three thousand, eight hundred sixteen".