404040823 has 2 divisors, whose sum is σ = 404040824. Its totient is φ = 404040822.

The previous prime is 404040821. The next prime is 404040841. The reversal of 404040823 is 328040404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404040823 - 2¹ = 404040821 is a prime.

Together with 404040821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404040821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202020411 + 202020412.

It is an arithmetic number, because the mean of its divisors is an integer number (202020412).

Almost surely, 2^404040823 is an apocalyptic number.

404040823 is a deficient number, since it is larger than the sum of its proper divisors (1).

404040823 is an equidigital number, since it uses as much as digits as its factorization.

404040823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 404040823 is about 20100.7667266699. The cubic root of 404040823 is about 739.2790781457.

The spelling of 404040823 in words is "four hundred four million, forty thousand, eight hundred twenty-three".