138891837 has 16 divisors (see below), whose sum is σ = 212406912. Its totient is φ = 79080960.

The previous prime is 138891829. The next prime is 138891847. The reversal of 138891837 is 738198831.

It is not a de Polignac number, because 138891837 - 2³ = 138891829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138891847) 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, 5868 + ... + 17669.

It is an arithmetic number, because the mean of its divisors is an integer number (13275432).

Almost surely, 2^138891837 is an apocalyptic number.

It is an amenable number.

138891837 is a deficient number, since it is larger than the sum of its proper divisors (73515075).

138891837 is a wasteful number, since it uses less digits than its factorization.

138891837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23828.

The product of its digits is 290304, while the sum is 48.

The square root of 138891837 is about 11785.2380968736. The cubic root of 138891837 is about 517.8757484864.

The spelling of 138891837 in words is "one hundred thirty-eight million, eight hundred ninety-one thousand, eight hundred thirty-seven".