138891835 has 4 divisors (see below), whose sum is σ = 166670208. Its totient is φ = 111113464.

The previous prime is 138891829. The next prime is 138891847. The reversal of 138891835 is 538198831.

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 138891835 - 2⁷ = 138891707 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13889179 + ... + 13889188.

It is an arithmetic number, because the mean of its divisors is an integer number (41667552).

Almost surely, 2^138891835 is an apocalyptic number.

138891835 is a deficient number, since it is larger than the sum of its proper divisors (27778373).

138891835 is an equidigital number, since it uses as much as digits as its factorization.

138891835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27778372.

The product of its digits is 207360, while the sum is 46.

The square root of 138891835 is about 11785.2380120216. The cubic root of 138891835 is about 517.8757460006.

The spelling of 138891835 in words is "one hundred thirty-eight million, eight hundred ninety-one thousand, eight hundred thirty-five".