138533885 has 16 divisors (see below), whose sum is σ = 196119552. Its totient is φ = 91929600.

The previous prime is 138533881. The next prime is 138533909. The reversal of 138533885 is 588335831.

It is not a de Polignac number, because 138533885 - 2² = 138533881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138533881) 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, 62756 + ... + 64925.

It is an arithmetic number, because the mean of its divisors is an integer number (12257472).

Almost surely, 2^138533885 is an apocalyptic number.

It is an amenable number.

138533885 is a deficient number, since it is larger than the sum of its proper divisors (57585667).

138533885 is a wasteful number, since it uses less digits than its factorization.

138533885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127724.

The product of its digits is 345600, while the sum is 44.

The square root of 138533885 is about 11770.0418435960. The cubic root of 138533885 is about 517.4304760079.

The spelling of 138533885 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, eight hundred eighty-five".