138236983 has 4 divisors (see below), whose sum is σ = 139605768. Its totient is φ = 136868200.

The previous prime is 138236977. The next prime is 138237007. The reversal of 138236983 is 389632831.

138236983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138236983 - 2²⁵ = 104682551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138236933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684241 + ... + 684442.

It is an arithmetic number, because the mean of its divisors is an integer number (34901442).

Almost surely, 2^138236983 is an apocalyptic number.

138236983 is a deficient number, since it is larger than the sum of its proper divisors (1368785).

138236983 is a wasteful number, since it uses less digits than its factorization.

138236983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368784.

The product of its digits is 186624, while the sum is 43.

The square root of 138236983 is about 11757.4224641288. The cubic root of 138236983 is about 517.0605640470.

The spelling of 138236983 in words is "one hundred thirty-eight million, two hundred thirty-six thousand, nine hundred eighty-three".