404044393 has 2 divisors, whose sum is σ = 404044394. Its totient is φ = 404044392.

The previous prime is 404044369. The next prime is 404044409. The reversal of 404044393 is 393440404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355435609 + 48608784 = 18853^2 + 6972^2 .

It is a cyclic number.

It is not a de Polignac number, because 404044393 - 2⁹ = 404043881 is a prime.

It is not a weakly prime, because it can be changed into another prime (404044313) 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, 202022196 + 202022197.

It is an arithmetic number, because the mean of its divisors is an integer number (202022197).

Almost surely, 2^404044393 is an apocalyptic number.

It is an amenable number.

404044393 is a deficient number, since it is larger than the sum of its proper divisors (1).

404044393 is an equidigital number, since it uses as much as digits as its factorization.

404044393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 404044393 is about 20100.8555290565. The cubic root of 404044393 is about 739.2812554988.

Adding to 404044393 its reverse (393440404), we get a palindrome (797484797).

The spelling of 404044393 in words is "four hundred four million, forty-four thousand, three hundred ninety-three".