139040839 has 4 divisors (see below), whose sum is σ = 158903824. Its totient is φ = 119177856.

The previous prime is 139040821. The next prime is 139040843. The reversal of 139040839 is 938040931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139040839 - 2¹¹ = 139038791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139040798 and 139040807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139040849) 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, 9931482 + ... + 9931495.

It is an arithmetic number, because the mean of its divisors is an integer number (39725956).

Almost surely, 2^139040839 is an apocalyptic number.

139040839 is a deficient number, since it is larger than the sum of its proper divisors (19862985).

139040839 is an equidigital number, since it uses as much as digits as its factorization.

139040839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19862984.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 139040839 is about 11791.5579547403. The cubic root of 139040839 is about 518.0608732246.

The spelling of 139040839 in words is "one hundred thirty-nine million, forty thousand, eight hundred thirty-nine".