139173907 has 4 divisors (see below), whose sum is σ = 139271536. Its totient is φ = 139076280.

The previous prime is 139173901. The next prime is 139173949. The reversal of 139173907 is 709371931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 709371931 = 24697 ⋅28723.

It is a cyclic number.

It is not a de Polignac number, because 139173907 - 2³ = 139173899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139173907.

It is not an unprimeable number, because it can be changed into a prime (139173901) 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, 46644 + ... + 49537.

It is an arithmetic number, because the mean of its divisors is an integer number (34817884).

Almost surely, 2^139173907 is an apocalyptic number.

139173907 is a deficient number, since it is larger than the sum of its proper divisors (97629).

139173907 is an equidigital number, since it uses as much as digits as its factorization.

139173907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97628.

The product of its (nonzero) digits is 35721, while the sum is 40.

The square root of 139173907 is about 11797.1991167395. The cubic root of 139173907 is about 518.2260892970.

The spelling of 139173907 in words is "one hundred thirty-nine million, one hundred seventy-three thousand, nine hundred seven".