138812839 has 16 divisors (see below), whose sum is σ = 155748096. Its totient is φ = 122622400.

The previous prime is 138812833. The next prime is 138812887. The reversal of 138812839 is 938218831.

It is a cyclic number.

It is not a de Polignac number, because 138812839 - 2³ = 138812831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138812795 and 138812804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138812831) 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 15 ways as a sum of consecutive naturals, for example, 156054 + ... + 156940.

It is an arithmetic number, because the mean of its divisors is an integer number (9734256).

Almost surely, 2^138812839 is an apocalyptic number.

138812839 is a deficient number, since it is larger than the sum of its proper divisors (16935257).

138812839 is a wasteful number, since it uses less digits than its factorization.

138812839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286.

The product of its digits is 82944, while the sum is 43.

The square root of 138812839 is about 11781.8860544482. The cubic root of 138812839 is about 517.7775451936. Note that the first 3 decimals are identical.

The spelling of 138812839 in words is "one hundred thirty-eight million, eight hundred twelve thousand, eight hundred thirty-nine".