139039729 has 2 divisors, whose sum is σ = 139039730. Its totient is φ = 139039728.

The previous prime is 139039699. The next prime is 139039751. The reversal of 139039729 is 927930931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117137329 + 21902400 = 10823^2 + 4680^2 .

It is a cyclic number.

It is not a de Polignac number, because 139039729 - 2⁹ = 139039217 is a prime.

It is not a weakly prime, because it can be changed into another prime (139039129) 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 as a sum of consecutive naturals, namely, 69519864 + 69519865.

It is an arithmetic number, because the mean of its divisors is an integer number (69519865).

Almost surely, 2^139039729 is an apocalyptic number.

It is an amenable number.

139039729 is a deficient number, since it is larger than the sum of its proper divisors (1).

139039729 is an equidigital number, since it uses as much as digits as its factorization.

139039729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 139039729 is about 11791.5108870747. The cubic root of 139039729 is about 518.0594946150.

It can be divided in two parts, 13903 and 9729, that added together give a palindrome (23632).

The spelling of 139039729 in words is "one hundred thirty-nine million, thirty-nine thousand, seven hundred twenty-nine".