123439 has 2 divisors, whose sum is σ = 123440. Its totient is φ = 123438.

The previous prime is 123433. The next prime is 123449. The reversal of 123439 is 934321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123439 - 2⁵ = 123407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61719 + 61720.

It is an arithmetic number, because the mean of its divisors is an integer number (61720).

2¹²³⁴³⁹ is an apocalyptic number.

123439 is a deficient number, since it is larger than the sum of its proper divisors (1).

123439 is an equidigital number, since it uses as much as digits as its factorization.

123439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 22.

The square root of 123439 is about 351.3388677616. The cubic root of 123439 is about 49.7909942157.

The spelling of 123439 in words is "one hundred twenty-three thousand, four hundred thirty-nine".