123639231 has 12 divisors (see below), whose sum is σ = 168978056. Its totient is φ = 80412480.

The previous prime is 123639221. The next prime is 123639239. The reversal of 123639231 is 132936321.

It is not a de Polignac number, because 123639231 - 2⁶ = 123639167 is a prime.

It is a super-2 number, since 2×123639231² = 30573318884542722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123639239) 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, 7216 + ... + 17301.

Almost surely, 2^123639231 is an apocalyptic number.

123639231 is a deficient number, since it is larger than the sum of its proper divisors (45338825).

123639231 is an equidigital number, since it uses as much as digits as its factorization.

123639231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24602 (or 24561 counting only the distinct ones).

The product of its digits is 5832, while the sum is 30.

The square root of 123639231 is about 11119.3179197287. The cubic root of 123639231 is about 498.1790174294.

The spelling of 123639231 in words is "one hundred twenty-three million, six hundred thirty-nine thousand, two hundred thirty-one".