139258729 has 4 divisors (see below), whose sum is σ = 140694484. Its totient is φ = 137822976.

The previous prime is 139258711. The next prime is 139258739. The reversal of 139258729 is 927852931.

139258729 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: 927852931 = 2203 ⋅421177.

It can be written as a sum of positive squares in 2 ways, for example, as 75690000 + 63568729 = 8700^2 + 7973^2 .

It is a cyclic number.

It is not a de Polignac number, because 139258729 - 2¹³ = 139250537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139258739) 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, 717732 + ... + 717925.

It is an arithmetic number, because the mean of its divisors is an integer number (35173621).

Almost surely, 2^139258729 is an apocalyptic number.

It is an amenable number.

139258729 is a deficient number, since it is larger than the sum of its proper divisors (1435755).

139258729 is an equidigital number, since it uses as much as digits as its factorization.

139258729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435754.

The product of its digits is 272160, while the sum is 46.

The square root of 139258729 is about 11800.7935750101. The cubic root of 139258729 is about 518.3313486022.

The spelling of 139258729 in words is "one hundred thirty-nine million, two hundred fifty-eight thousand, seven hundred twenty-nine".