139044845 has 4 divisors (see below), whose sum is σ = 166853820. Its totient is φ = 111235872.

The previous prime is 139044839. The next prime is 139044881. The reversal of 139044845 is 548440931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548440931 = 59 ⋅9295609.

It can be written as a sum of positive squares in 2 ways, for example, as 21409129 + 117635716 = 4627^2 + 10846^2 .

It is a cyclic number.

It is not a de Polignac number, because 139044845 - 2²⁰ = 137996269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139044799 and 139044808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13904480 + ... + 13904489.

It is an arithmetic number, because the mean of its divisors is an integer number (41713455).

Almost surely, 2^139044845 is an apocalyptic number.

It is an amenable number.

139044845 is a deficient number, since it is larger than the sum of its proper divisors (27808975).

139044845 is an equidigital number, since it uses as much as digits as its factorization.

139044845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27808974.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 139044845 is about 11791.7278208073. The cubic root of 139044845 is about 518.0658485780.

The spelling of 139044845 in words is "one hundred thirty-nine million, forty-four thousand, eight hundred forty-five".