404844807989 has 2 divisors, whose sum is σ = 404844807990. Its totient is φ = 404844807988.

The previous prime is 404844807971. The next prime is 404844808021. The reversal of 404844807989 is 989708448404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202869168100 + 201975639889 = 450410^2 + 449417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404844807989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404844807929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202422403994 + 202422403995.

It is an arithmetic number, because the mean of its divisors is an integer number (202422403995).

Almost surely, 2^404844807989 is an apocalyptic number.

It is an amenable number.

404844807989 is a deficient number, since it is larger than the sum of its proper divisors (1).

404844807989 is an equidigital number, since it uses as much as digits as its factorization.

404844807989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74317824, while the sum is 65.

The spelling of 404844807989 in words is "four hundred four billion, eight hundred forty-four million, eight hundred seven thousand, nine hundred eighty-nine".