404288789 has 2 divisors, whose sum is σ = 404288790. Its totient is φ = 404288788.

The previous prime is 404288777. The next prime is 404288791. The reversal of 404288789 is 987882404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214124689 + 190164100 = 14633^2 + 13790^2 .

It is a cyclic number.

It is not a de Polignac number, because 404288789 - 2¹² = 404284693 is a prime.

It is a super-2 number, since 2×404288789² = 326898849822173042, which contains 22 as substring.

Together with 404288791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404288749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202144394 + 202144395.

It is an arithmetic number, because the mean of its divisors is an integer number (202144395).

Almost surely, 2^404288789 is an apocalyptic number.

It is an amenable number.

404288789 is a deficient number, since it is larger than the sum of its proper divisors (1).

404288789 is an equidigital number, since it uses as much as digits as its factorization.

404288789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The square root of 404288789 is about 20106.9338537729. The cubic root of 404288789 is about 739.4302828235.

The spelling of 404288789 in words is "four hundred four million, two hundred eighty-eight thousand, seven hundred eighty-nine".