139697 has 2 divisors, whose sum is σ = 139698. Its totient is φ = 139696.

The previous prime is 139681. The next prime is 139703. The reversal of 139697 is 796931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128881 + 10816 = 359^2 + 104^2 .

It is an emirp because it is prime and its reverse (796931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139697 - 2⁴ = 139681 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139697.

It is not a weakly prime, because it can be changed into another prime (139627) 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, 69848 + 69849.

It is an arithmetic number, because the mean of its divisors is an integer number (69849).

2¹³⁹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

139697 is a deficient number, since it is larger than the sum of its proper divisors (1).

139697 is an equidigital number, since it uses as much as digits as its factorization.

139697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 35.

The square root of 139697 is about 373.7606185783. The cubic root of 139697 is about 51.8874538251.

The spelling of 139697 in words is "one hundred thirty-nine thousand, six hundred ninety-seven".