139342779 has 6 divisors (see below), whose sum is σ = 201272916. Its totient is φ = 92895180.

The previous prime is 139342771. The next prime is 139342811. The reversal of 139342779 is 977243931.

It is not a de Polignac number, because 139342779 - 2³ = 139342771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139342771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7741257 + ... + 7741274.

It is an arithmetic number, because the mean of its divisors is an integer number (33545486).

Almost surely, 2^139342779 is an apocalyptic number.

139342779 is a deficient number, since it is larger than the sum of its proper divisors (61930137).

139342779 is a wasteful number, since it uses less digits than its factorization.

139342779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15482537 (or 15482534 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 139342779 is about 11804.3542390086. The cubic root of 139342779 is about 518.4356077472.

The spelling of 139342779 in words is "one hundred thirty-nine million, three hundred forty-two thousand, seven hundred seventy-nine".