139508729 has 2 divisors, whose sum is σ = 139508730. Its totient is φ = 139508728.

The previous prime is 139508723. The next prime is 139508741. The reversal of 139508729 is 927805931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79477225 + 60031504 = 8915^2 + 7748^2 .

It is a cyclic number.

It is not a de Polignac number, because 139508729 - 2¹² = 139504633 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139508729.

It is not a weakly prime, because it can be changed into another prime (139508723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69754364 + 69754365.

It is an arithmetic number, because the mean of its divisors is an integer number (69754365).

Almost surely, 2^139508729 is an apocalyptic number.

It is an amenable number.

139508729 is a deficient number, since it is larger than the sum of its proper divisors (1).

139508729 is an equidigital number, since it uses as much as digits as its factorization.

139508729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 139508729 is about 11811.3813332734. The cubic root of 139508729 is about 518.6413360433.

The spelling of 139508729 in words is "one hundred thirty-nine million, five hundred eight thousand, seven hundred twenty-nine".