404080409 has 4 divisors (see below), whose sum is σ = 410704740. Its totient is φ = 397456080.

The previous prime is 404080393. The next prime is 404080447. The reversal of 404080409 is 904080404.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57078025 + 347002384 = 7555^2 + 18628^2 .

It is a cyclic number.

It is not a de Polignac number, because 404080409 - 2⁴ = 404080393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404080499) 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 in 3 ways as a sum of consecutive naturals, for example, 3312074 + ... + 3312195.

It is an arithmetic number, because the mean of its divisors is an integer number (102676185).

Almost surely, 2^404080409 is an apocalyptic number.

It is an amenable number.

404080409 is a deficient number, since it is larger than the sum of its proper divisors (6624331).

404080409 is an equidigital number, since it uses as much as digits as its factorization.

404080409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6624330.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 404080409 is about 20101.7513913589. The cubic root of 404080409 is about 739.3032210411.

The spelling of 404080409 in words is "four hundred four million, eighty thousand, four hundred nine".