138867013 has 4 divisors (see below), whose sum is σ = 139698720. Its totient is φ = 138035308.

The previous prime is 138866989. The next prime is 138867017. The reversal of 138867013 is 310768831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138867013 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 (138867017) 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, 415603 + ... + 415936.

It is an arithmetic number, because the mean of its divisors is an integer number (34924680).

Almost surely, 2^138867013 is an apocalyptic number.

It is an amenable number.

138867013 is a deficient number, since it is larger than the sum of its proper divisors (831707).

138867013 is an equidigital number, since it uses as much as digits as its factorization.

138867013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831706.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 138867013 is about 11784.1848678642. The cubic root of 138867013 is about 517.8448935088.

The spelling of 138867013 in words is "one hundred thirty-eight million, eight hundred sixty-seven thousand, thirteen".