139099729 has 4 divisors (see below), whose sum is σ = 147282084. Its totient is φ = 130917376.

The previous prime is 139099691. The next prime is 139099739. The reversal of 139099729 is 927990931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124099600 + 15000129 = 11140^2 + 3873^2 .

It is a cyclic number.

It is not a de Polignac number, because 139099729 - 2¹¹ = 139097681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139099739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4091152 + ... + 4091185.

It is an arithmetic number, because the mean of its divisors is an integer number (36820521).

Almost surely, 2^139099729 is an apocalyptic number.

It is an amenable number.

139099729 is a deficient number, since it is larger than the sum of its proper divisors (8182355).

139099729 is an equidigital number, since it uses as much as digits as its factorization.

139099729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182354.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 139099729 is about 11794.0548158808. The cubic root of 139099729 is about 518.1340035337.

The spelling of 139099729 in words is "one hundred thirty-nine million, ninety-nine thousand, seven hundred twenty-nine".