123505456 has 20 divisors (see below), whose sum is σ = 239857912. Its totient is φ = 61606656.

The previous prime is 123505451. The next prime is 123505471. The reversal of 123505456 is 654505321.

It is not an unprimeable number, because it can be changed into a prime (123505451) 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, 1986 + ... + 15841.

Almost surely, 2^123505456 is an apocalyptic number.

123505456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123505456 is a deficient number, since it is larger than the sum of its proper divisors (116352456).

123505456 is a wasteful number, since it uses less digits than its factorization.

123505456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18268 (or 18262 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 123505456 is about 11113.3008597806. The cubic root of 123505456 is about 497.9992795805. Note that the first 3 decimals are identical.

The spelling of 123505456 in words is "one hundred twenty-three million, five hundred five thousand, four hundred fifty-six".