139728513 has 4 divisors (see below), whose sum is σ = 186304688. Its totient is φ = 93152340.

The previous prime is 139728503. The next prime is 139728529. The reversal of 139728513 is 315827931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315827931 = 3 ⋅105275977.

It is not a de Polignac number, because 139728513 - 2¹⁷ = 139597441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139728503) 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, 23288083 + ... + 23288088.

It is an arithmetic number, because the mean of its divisors is an integer number (46576172).

Almost surely, 2^139728513 is an apocalyptic number.

It is an amenable number.

139728513 is a deficient number, since it is larger than the sum of its proper divisors (46576175).

139728513 is an equidigital number, since it uses as much as digits as its factorization.

139728513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46576174.

The product of its digits is 45360, while the sum is 39.

The square root of 139728513 is about 11820.6815793337. The cubic root of 139728513 is about 518.9135514107.

The spelling of 139728513 in words is "one hundred thirty-nine million, seven hundred twenty-eight thousand, five hundred thirteen".