139728439 has 6 divisors (see below), whose sum is σ = 144382200. Its totient is φ = 135220140.

The previous prime is 139728431. The next prime is 139728503. The reversal of 139728439 is 934827931.

It is not a de Polignac number, because 139728439 - 2³ = 139728431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139728431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71739 + ... + 73660.

It is an arithmetic number, because the mean of its divisors is an integer number (24063700).

Almost surely, 2^139728439 is an apocalyptic number.

139728439 is a deficient number, since it is larger than the sum of its proper divisors (4653761).

139728439 is an equidigital number, since it uses as much as digits as its factorization.

139728439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145461 (or 145430 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 139728439 is about 11820.6784492262. The cubic root of 139728439 is about 518.9134598054.

The spelling of 139728439 in words is "one hundred thirty-nine million, seven hundred twenty-eight thousand, four hundred thirty-nine".