404380409 has 2 divisors, whose sum is σ = 404380410. Its totient is φ = 404380408.

The previous prime is 404380393. The next prime is 404380423. The reversal of 404380409 is 904083404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375274384 + 29106025 = 19372^2 + 5395^2 .

It is a cyclic number.

It is not a de Polignac number, because 404380409 - 2⁴ = 404380393 is a prime.

It is not a weakly prime, because it can be changed into another prime (404380609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202190204 + 202190205.

It is an arithmetic number, because the mean of its divisors is an integer number (202190205).

Almost surely, 2^404380409 is an apocalyptic number.

It is an amenable number.

404380409 is a deficient number, since it is larger than the sum of its proper divisors (1).

404380409 is an equidigital number, since it uses as much as digits as its factorization.

404380409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 404380409 is about 20109.2120432403. The cubic root of 404380409 is about 739.4861352137.

The spelling of 404380409 in words is "four hundred four million, three hundred eighty thousand, four hundred nine".