123968239 has 4 divisors (see below), whose sum is σ = 124359624. Its totient is φ = 123576856.

The previous prime is 123968237. The next prime is 123968279. The reversal of 123968239 is 932869321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932869321 = 5087 ⋅183383.

It is a cyclic number.

It is not a de Polignac number, because 123968239 - 2¹ = 123968237 is a prime.

It is a super-2 number, since 2×123968239² = 30736248561522242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123968195 and 123968204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123968237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195217 + ... + 195850.

It is an arithmetic number, because the mean of its divisors is an integer number (31089906).

Almost surely, 2^123968239 is an apocalyptic number.

123968239 is a deficient number, since it is larger than the sum of its proper divisors (391385).

123968239 is an equidigital number, since it uses as much as digits as its factorization.

123968239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391384.

The product of its digits is 139968, while the sum is 43.

The square root of 123968239 is about 11134.1025233289. The cubic root of 123968239 is about 498.6205162158.

The spelling of 123968239 in words is "one hundred twenty-three million, nine hundred sixty-eight thousand, two hundred thirty-nine".