139439 has 2 divisors, whose sum is σ = 139440. Its totient is φ = 139438.

The previous prime is 139429. The next prime is 139457. The reversal of 139439 is 934931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139439 - 2⁴ = 139423 is a prime.

It is a Sophie Germain 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 139439.

It is not a weakly prime, because it can be changed into another prime (139409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69719 + 69720.

It is an arithmetic number, because the mean of its divisors is an integer number (69720).

2¹³⁹⁴³⁹ is an apocalyptic number.

139439 is a deficient number, since it is larger than the sum of its proper divisors (1).

139439 is an equidigital number, since it uses as much as digits as its factorization.

139439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 29.

The square root of 139439 is about 373.4153183789. The cubic root of 139439 is about 51.8554912852.

The spelling of 139439 in words is "one hundred thirty-nine thousand, four hundred thirty-nine".