138992885 has 16 divisors (see below), whose sum is σ = 176707200. Its totient is φ = 104659776.

The previous prime is 138992881. The next prime is 138992891. The reversal of 138992885 is 588299831.

138992885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138992885 - 2² = 138992881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138992881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10256 + ... + 19574.

It is an arithmetic number, because the mean of its divisors is an integer number (11044200).

Almost surely, 2^138992885 is an apocalyptic number.

It is an amenable number.

138992885 is a deficient number, since it is larger than the sum of its proper divisors (37714315).

138992885 is a wasteful number, since it uses less digits than its factorization.

138992885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9500.

The product of its digits is 1244160, while the sum is 53.

The square root of 138992885 is about 11789.5243754784. The cubic root of 138992885 is about 518.0013081167.

The spelling of 138992885 in words is "one hundred thirty-eight million, nine hundred ninety-two thousand, eight hundred eighty-five".