404500409 has 2 divisors, whose sum is σ = 404500410. Its totient is φ = 404500408.

The previous prime is 404500357. The next prime is 404500433. The reversal of 404500409 is 904005404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379470400 + 25030009 = 19480^2 + 5003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404500409 is a prime.

It is not a weakly prime, because it can be changed into another prime (404500489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202250204 + 202250205.

It is an arithmetic number, because the mean of its divisors is an integer number (202250205).

Almost surely, 2^404500409 is an apocalyptic number.

It is an amenable number.

404500409 is a deficient number, since it is larger than the sum of its proper divisors (1).

404500409 is an equidigital number, since it uses as much as digits as its factorization.

404500409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 404500409 is about 20112.1955290814. The cubic root of 404500409 is about 739.5592755522.

The spelling of 404500409 in words is "four hundred four million, five hundred thousand, four hundred nine".