138399168 has 28 divisors (see below), whose sum is σ = 366181640. Its totient is φ = 46132992.

The previous prime is 138399133. The next prime is 138399187. The reversal of 138399168 is 861993831.

138399168 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360223 + ... + 360606.

Almost surely, 2^138399168 is an apocalyptic number.

It is an amenable number.

138399168 is an abundant number, since it is smaller than the sum of its proper divisors (227782472).

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

138399168 is an equidigital number, since it uses as much as digits as its factorization.

138399168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720844 (or 720834 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 138399168 is about 11764.3175747682. The cubic root of 138399168 is about 517.2626968661.

The spelling of 138399168 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, one hundred sixty-eight".