123638864 has 20 divisors (see below), whose sum is σ = 239791200. Its totient is φ = 61757280.

The previous prime is 123638863. The next prime is 123638873. The reversal of 123638864 is 468836321.

It is a happy number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123638863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15437 + ... + 22035.

It is an arithmetic number, because the mean of its divisors is an integer number (11989560).

Almost surely, 2^123638864 is an apocalyptic number.

It is an amenable number.

123638864 is a deficient number, since it is larger than the sum of its proper divisors (116152336).

123638864 is a wasteful number, since it uses less digits than its factorization.

123638864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7778 (or 7772 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 123638864 is about 11119.3014169057. The cubic root of 123638864 is about 498.1785245117.

The spelling of 123638864 in words is "one hundred twenty-three million, six hundred thirty-eight thousand, eight hundred sixty-four".