139604831 has 4 divisors (see below), whose sum is σ = 140081592. Its totient is φ = 139128072.

The previous prime is 139604827. The next prime is 139604849. The reversal of 139604831 is 138406931.

139604831 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: 138406931 = 13 ⋅10646687.

It is a cyclic number.

It is not a de Polignac number, because 139604831 - 2² = 139604827 is a prime.

It is a super-2 number, since 2×139604831² = 38979017677077122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139604791 and 139604800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139604891) 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, 237941 + ... + 238526.

It is an arithmetic number, because the mean of its divisors is an integer number (35020398).

Almost surely, 2^139604831 is an apocalyptic number.

139604831 is a deficient number, since it is larger than the sum of its proper divisors (476761).

139604831 is an equidigital number, since it uses as much as digits as its factorization.

139604831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476760.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 139604831 is about 11815.4488277001. The cubic root of 139604831 is about 518.7603991528.

The spelling of 139604831 in words is "one hundred thirty-nine million, six hundred four thousand, eight hundred thirty-one".