123681239 has 12 divisors (see below), whose sum is σ = 143946432. Its totient is φ = 105821760.

The previous prime is 123681223. The next prime is 123681247. The reversal of 123681239 is 932186321.

It is not a de Polignac number, because 123681239 - 2⁴ = 123681223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123681199 and 123681208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123681139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28007 + ... + 32120.

It is an arithmetic number, because the mean of its divisors is an integer number (11995536).

Almost surely, 2^123681239 is an apocalyptic number.

123681239 is a deficient number, since it is larger than the sum of its proper divisors (20265193).

123681239 is a wasteful number, since it uses less digits than its factorization.

123681239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60166 (or 60155 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 123681239 is about 11121.2067240925. The cubic root of 123681239 is about 498.2354319248.

The spelling of 123681239 in words is "one hundred twenty-three million, six hundred eighty-one thousand, two hundred thirty-nine".