139115728 has 10 divisors (see below), whose sum is σ = 269536754. Its totient is φ = 69557856.

The previous prime is 139115699. The next prime is 139115741. The reversal of 139115728 is 827511931.

It can be written as a sum of positive squares in only one way, i.e., 105103504 + 34012224 = 10252^2 + 5832^2 .

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, 4347351 + ... + 4347382.

Almost surely, 2^139115728 is an apocalyptic number.

It is an amenable number.

139115728 is a deficient number, since it is larger than the sum of its proper divisors (130421026).

139115728 is an equidigital number, since it uses as much as digits as its factorization.

139115728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8694741 (or 8694735 counting only the distinct ones).

The product of its digits is 15120, while the sum is 37.

The square root of 139115728 is about 11794.7330618374. The cubic root of 139115728 is about 518.1538677184.

The spelling of 139115728 in words is "one hundred thirty-nine million, one hundred fifteen thousand, seven hundred twenty-eight".