123239 has 2 divisors, whose sum is σ = 123240. Its totient is φ = 123238.

The previous prime is 123229. The next prime is 123259. The reversal of 123239 is 932321.

It is an a-pointer prime, because the next prime (123259) can be obtained adding 123239 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123239 is a prime.

It is a super-2 number, since 2×123239² = 30375702242, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 123239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61619 + 61620.

It is an arithmetic number, because the mean of its divisors is an integer number (61620).

2¹²³²³⁹ is an apocalyptic number.

123239 is a deficient number, since it is larger than the sum of its proper divisors (1).

123239 is an equidigital number, since it uses as much as digits as its factorization.

123239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 123239 is about 351.0541268807. The cubic root of 123239 is about 49.7640886675.

The spelling of 123239 in words is "one hundred twenty-three thousand, two hundred thirty-nine".