404440423 has 2 divisors, whose sum is σ = 404440424. Its totient is φ = 404440422.

The previous prime is 404440417. The next prime is 404440427. The reversal of 404440423 is 324044404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404440423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404440427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202220211 + 202220212.

It is an arithmetic number, because the mean of its divisors is an integer number (202220212).

Almost surely, 2^404440423 is an apocalyptic number.

404440423 is a deficient number, since it is larger than the sum of its proper divisors (1).

404440423 is an equidigital number, since it uses as much as digits as its factorization.

404440423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 25.

The square root of 404440423 is about 20110.7041895603. The cubic root of 404440423 is about 739.5227157244.

Adding to 404440423 its reverse (324044404), we get a palindrome (728484827).

The spelling of 404440423 in words is "four hundred four million, four hundred forty thousand, four hundred twenty-three".