138232989 has 6 divisors (see below), whose sum is σ = 199669886. Its totient is φ = 92155320.

The previous prime is 138232981. The next prime is 138233009. The reversal of 138232989 is 989232831.

It can be written as a sum of positive squares in only one way, i.e., 81757764 + 56475225 = 9042^2 + 7515^2 .

It is not a de Polignac number, because 138232989 - 2³ = 138232981 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 (138232981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7679602 + ... + 7679619.

Almost surely, 2^138232989 is an apocalyptic number.

It is an amenable number.

138232989 is a deficient number, since it is larger than the sum of its proper divisors (61436897).

138232989 is a wasteful number, since it uses less digits than its factorization.

138232989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15359227 (or 15359224 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 138232989 is about 11757.2526127493. The cubic root of 138232989 is about 517.0555842900.

The spelling of 138232989 in words is "one hundred thirty-eight million, two hundred thirty-two thousand, nine hundred eighty-nine".