123256404 has 84 divisors (see below), whose sum is σ = 331257696. Its totient is φ = 40089168.

The previous prime is 123256391. The next prime is 123256423. The reversal of 123256404 is 404652321.

123256404 is a `hidden beast` number, since 1 + 2 + 3 + 256 + 404 = 666.

It is a super-2 number, since 2×123256404² = 30384282254022432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 124897 + ... + 125879.

It is an arithmetic number, because the mean of its divisors is an integer number (3943544).

Almost surely, 2^123256404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123256404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165628848).

123256404 is an abundant number, since it is smaller than the sum of its proper divisors (208001292).

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

123256404 is an equidigital number, since it uses as much as digits as its factorization.

123256404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 123256404 is about 11102.0900734952. The cubic root of 123256404 is about 497.6643114409.

The spelling of 123256404 in words is "one hundred twenty-three million, two hundred fifty-six thousand, four hundred four".