139138139 has 16 divisors (see below), whose sum is σ = 161004480. Its totient is φ = 117780480.

The previous prime is 139138099. The next prime is 139138157. The reversal of 139138139 is 931831931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139138139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139138739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244247 + ... + 244815.

It is an arithmetic number, because the mean of its divisors is an integer number (10062780).

Almost surely, 2^139138139 is an apocalyptic number.

139138139 is a deficient number, since it is larger than the sum of its proper divisors (21866341).

139138139 is a wasteful number, since it uses less digits than its factorization.

139138139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950.

The product of its digits is 17496, while the sum is 38.

The square root of 139138139 is about 11795.6830662747. The cubic root of 139138139 is about 518.1816904119.

The spelling of 139138139 in words is "one hundred thirty-nine million, one hundred thirty-eight thousand, one hundred thirty-nine".