404401997 has 2 divisors, whose sum is σ = 404401998. Its totient is φ = 404401996.

The previous prime is 404401981. The next prime is 404402003. The reversal of 404401997 is 799104404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342213001 + 62188996 = 18499^2 + 7886^2 .

It is a cyclic number.

It is not a de Polignac number, because 404401997 - 2⁴ = 404401981 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404401997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404401937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202200998 + 202200999.

It is an arithmetic number, because the mean of its divisors is an integer number (202200999).

Almost surely, 2^404401997 is an apocalyptic number.

It is an amenable number.

404401997 is a deficient number, since it is larger than the sum of its proper divisors (1).

404401997 is an equidigital number, since it uses as much as digits as its factorization.

404401997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 404401997 is about 20109.7488049951. The cubic root of 404401997 is about 739.4992942279.

The spelling of 404401997 in words is "four hundred four million, four hundred one thousand, nine hundred ninety-seven".