404004023 has 2 divisors, whose sum is σ = 404004024. Its totient is φ = 404004022.

The previous prime is 404003983. The next prime is 404004043. The reversal of 404004023 is 320400404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404004023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404003992 and 404004010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404004043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202002011 + 202002012.

It is an arithmetic number, because the mean of its divisors is an integer number (202002012).

Almost surely, 2^404004023 is an apocalyptic number.

404004023 is a deficient number, since it is larger than the sum of its proper divisors (1).

404004023 is an equidigital number, since it uses as much as digits as its factorization.

404004023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 404004023 is about 20099.8513178581. The cubic root of 404004023 is about 739.2566329747.

Adding to 404004023 its reverse (320400404), we get a palindrome (724404427).

The spelling of 404004023 in words is "four hundred four million, four thousand, twenty-three".