139369 has 2 divisors, whose sum is σ = 139370. Its totient is φ = 139368.

The previous prime is 139367. The next prime is 139387. The reversal of 139369 is 963931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97344 + 42025 = 312^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 139369 - 2¹ = 139367 is a prime.

It is a super-2 number, since 2×139369² = 38847436322, which contains 22 as substring.

Together with 139367, it forms a pair of twin primes.

It is a Chen prime.

139369 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 139369.

It is not a weakly prime, because it can be changed into another prime (139361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69684 + 69685.

It is an arithmetic number, because the mean of its divisors is an integer number (69685).

2¹³⁹³⁶⁹ is an apocalyptic number.

It is an amenable number.

139369 is a deficient number, since it is larger than the sum of its proper divisors (1).

139369 is an equidigital number, since it uses as much as digits as its factorization.

139369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 31.

The square root of 139369 is about 373.3215771959. The cubic root of 139369 is about 51.8468124795.

The spelling of 139369 in words is "one hundred thirty-nine thousand, three hundred sixty-nine".