123405564 has 24 divisors (see below), whose sum is σ = 288863568. Its totient is φ = 41004160.

The previous prime is 123405559. The next prime is 123405587. The reversal of 123405564 is 465504321.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12417 + ... + 20024.

It is an arithmetic number, because the mean of its divisors is an integer number (12035982).

Almost surely, 2^123405564 is an apocalyptic number.

It is an amenable number.

123405564 is an abundant number, since it is smaller than the sum of its proper divisors (165458004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123405564 is a wasteful number, since it uses less digits than its factorization.

123405564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32765 (or 32763 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 123405564 is about 11108.8056963834. The cubic root of 123405564 is about 497.8649817032.

Adding to 123405564 its reverse (465504321), we get a palindrome (588909885).

The spelling of 123405564 in words is "one hundred twenty-three million, four hundred five thousand, five hundred sixty-four".