139397 has 2 divisors, whose sum is σ = 139398. Its totient is φ = 139396.

The previous prime is 139393. The next prime is 139409. The reversal of 139397 is 793931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101761 + 37636 = 319^2 + 194^2 .

139397 is a truncatable prime.

It is an emirp because it is prime and its reverse (793931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139397 - 2² = 139393 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139397.

It is not a weakly prime, because it can be changed into another prime (139393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69698 + 69699.

It is an arithmetic number, because the mean of its divisors is an integer number (69699).

2¹³⁹³⁹⁷ is an apocalyptic number.

It is an amenable number.

139397 is a deficient number, since it is larger than the sum of its proper divisors (1).

139397 is an equidigital number, since it uses as much as digits as its factorization.

139397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103, while the sum is 32.

The square root of 139397 is about 373.3590764934. The cubic root of 139397 is about 51.8502843504.

The spelling of 139397 in words is "one hundred thirty-nine thousand, three hundred ninety-seven".