404252689 has 2 divisors, whose sum is σ = 404252690. Its totient is φ = 404252688.

The previous prime is 404252647. The next prime is 404252699. The reversal of 404252689 is 986252404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396328464 + 7924225 = 19908^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 404252689 - 2¹⁷ = 404121617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404252609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202126344 + 202126345.

It is an arithmetic number, because the mean of its divisors is an integer number (202126345).

Almost surely, 2^404252689 is an apocalyptic number.

It is an amenable number.

404252689 is a deficient number, since it is larger than the sum of its proper divisors (1).

404252689 is an equidigital number, since it uses as much as digits as its factorization.

404252689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 404252689 is about 20106.0361334600. The cubic root of 404252689 is about 739.4082736159.

The spelling of 404252689 in words is "four hundred four million, two hundred fifty-two thousand, six hundred eighty-nine".