139242679 has 4 divisors (see below), whose sum is σ = 139497784. Its totient is φ = 138987576.

The previous prime is 139242661. The next prime is 139242689. The reversal of 139242679 is 976242931.

139242679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 976242931 = 313 ⋅3118987.

It is a cyclic number.

It is not a de Polignac number, because 139242679 - 2¹⁷ = 139111607 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 (139242619) 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, 126732 + ... + 127825.

It is an arithmetic number, because the mean of its divisors is an integer number (34874446).

Almost surely, 2^139242679 is an apocalyptic number.

139242679 is a deficient number, since it is larger than the sum of its proper divisors (255105).

139242679 is an equidigital number, since it uses as much as digits as its factorization.

139242679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255104.

The product of its digits is 163296, while the sum is 43.

The square root of 139242679 is about 11800.1135164031. The cubic root of 139242679 is about 518.3114347392.

The spelling of 139242679 in words is "one hundred thirty-nine million, two hundred forty-two thousand, six hundred seventy-nine".