139729 has 2 divisors, whose sum is σ = 139730. Its totient is φ = 139728.

The previous prime is 139721. The next prime is 139739. The reversal of 139729 is 927931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90000 + 49729 = 300^2 + 223^2 .

It is a cyclic number.

It is not a de Polignac number, because 139729 - 2³ = 139721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139729.

It is not a weakly prime, because it can be changed into another prime (139721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69864 + 69865.

It is an arithmetic number, because the mean of its divisors is an integer number (69865).

2¹³⁹⁷²⁹ is an apocalyptic number.

It is an amenable number.

139729 is a deficient number, since it is larger than the sum of its proper divisors (1).

139729 is an equidigital number, since it uses as much as digits as its factorization.

139729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 139729 is about 373.8034242754. The cubic root of 139729 is about 51.8914154272.

It can be divided in two parts, 139 and 729, that added together give a palindrome (868).

The spelling of 139729 in words is "one hundred thirty-nine thousand, seven hundred twenty-nine".