404930989 has 2 divisors, whose sum is σ = 404930990. Its totient is φ = 404930988.

The previous prime is 404930987. The next prime is 404931013. The reversal of 404930989 is 989039404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 290975364 + 113955625 = 17058^2 + 10675^2 .

It is a cyclic number.

It is not a de Polignac number, because 404930989 - 2¹ = 404930987 is a prime.

Together with 404930987, 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 (404930987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202465494 + 202465495.

It is an arithmetic number, because the mean of its divisors is an integer number (202465495).

Almost surely, 2^404930989 is an apocalyptic number.

It is an amenable number.

404930989 is a deficient number, since it is larger than the sum of its proper divisors (1).

404930989 is an equidigital number, since it uses as much as digits as its factorization.

404930989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 404930989 is about 20122.8971323714. The cubic root of 404930989 is about 739.8215962672.

The spelling of 404930989 in words is "four hundred four million, nine hundred thirty thousand, nine hundred eighty-nine".