404204989 has 2 divisors, whose sum is σ = 404204990. Its totient is φ = 404204988.

The previous prime is 404204951. The next prime is 404205071. The reversal of 404204989 is 989402404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388760089 + 15444900 = 19717^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 404204989 - 2⁷ = 404204861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404204789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202102494 + 202102495.

It is an arithmetic number, because the mean of its divisors is an integer number (202102495).

Almost surely, 2^404204989 is an apocalyptic number.

It is an amenable number.

404204989 is a deficient number, since it is larger than the sum of its proper divisors (1).

404204989 is an equidigital number, since it uses as much as digits as its factorization.

404204989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 404204989 is about 20104.8498875271. The cubic root of 404204989 is about 739.3791901878.

The spelling of 404204989 in words is "four hundred four million, two hundred four thousand, nine hundred eighty-nine".