139391836 has 6 divisors (see below), whose sum is σ = 243935720. Its totient is φ = 69695916.

The previous prime is 139391827. The next prime is 139391849. The reversal of 139391836 is 638193931.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 139391792 and 139391801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17423976 + ... + 17423983.

Almost surely, 2^139391836 is an apocalyptic number.

It is an amenable number.

139391836 is a deficient number, since it is larger than the sum of its proper divisors (104543884).

139391836 is a wasteful number, since it uses less digits than its factorization.

139391836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34847963 (or 34847961 counting only the distinct ones).

The product of its digits is 104976, while the sum is 43.

The square root of 139391836 is about 11806.4319758342. The cubic root of 139391836 is about 518.4964407322.

The spelling of 139391836 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, eight hundred thirty-six".