139039879 has 4 divisors (see below), whose sum is σ = 151679880. Its totient is φ = 126399880.

The previous prime is 139039877. The next prime is 139039903. The reversal of 139039879 is 978930931.

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 139039879 - 2¹ = 139039877 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139039877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6319984 + ... + 6320005.

It is an arithmetic number, because the mean of its divisors is an integer number (37919970).

Almost surely, 2^139039879 is an apocalyptic number.

139039879 is a deficient number, since it is larger than the sum of its proper divisors (12640001).

139039879 is a wasteful number, since it uses less digits than its factorization.

139039879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12640000.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 139039879 is about 11791.5172475810. The cubic root of 139039879 is about 518.0596809140.

The spelling of 139039879 in words is "one hundred thirty-nine million, thirty-nine thousand, eight hundred seventy-nine".