123505864 has 8 divisors (see below), whose sum is σ = 231573510. Its totient is φ = 61752928.

The previous prime is 123505861. The next prime is 123505903. The reversal of 123505864 is 468505321.

It can be written as a sum of positive squares in only one way, i.e., 104652900 + 18852964 = 10230^2 + 4342^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (123505861) 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 as a sum of consecutive naturals, namely, 7719109 + ... + 7719124.

Almost surely, 2^123505864 is an apocalyptic number.

It is an amenable number.

123505864 is a deficient number, since it is larger than the sum of its proper divisors (108067646).

123505864 is a wasteful number, since it uses less digits than its factorization.

123505864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15438239 (or 15438235 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 123505864 is about 11113.3192161478. The cubic root of 123505864 is about 497.9998279597. Note that the first 3 decimals are identical.

The spelling of 123505864 in words is "one hundred twenty-three million, five hundred five thousand, eight hundred sixty-four".