404406823 has 2 divisors, whose sum is σ = 404406824. Its totient is φ = 404406822.

The previous prime is 404406817. The next prime is 404406857. The reversal of 404406823 is 328604404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404406823 - 2⁵ = 404406791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404406803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202203411 + 202203412.

It is an arithmetic number, because the mean of its divisors is an integer number (202203412).

Almost surely, 2^404406823 is an apocalyptic number.

404406823 is a deficient number, since it is larger than the sum of its proper divisors (1).

404406823 is an equidigital number, since it uses as much as digits as its factorization.

404406823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 404406823 is about 20109.8687961906. The cubic root of 404406823 is about 739.5022358631.

The spelling of 404406823 in words is "four hundred four million, four hundred six thousand, eight hundred twenty-three".