400823123 has 6 divisors (see below), whose sum is σ = 415122084. Its totient is φ = 387000824.

The previous prime is 400823119. The next prime is 400823147. The reversal of 400823123 is 321328004.

It is not a de Polignac number, because 400823123 - 2² = 400823119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400823723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 237461 + ... + 239142.

It is an arithmetic number, because the mean of its divisors is an integer number (69187014).

Almost surely, 2^400823123 is an apocalyptic number.

400823123 is a deficient number, since it is larger than the sum of its proper divisors (14298961).

400823123 is an equidigital number, since it uses as much as digits as its factorization.

400823123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476661 (or 476632 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 400823123 is about 20020.5674994492. The cubic root of 400823123 is about 737.3113552938.

The spelling of 400823123 in words is "four hundred million, eight hundred twenty-three thousand, one hundred twenty-three".