404993609 has 4 divisors (see below), whose sum is σ = 408778704. Its totient is φ = 401208516.

The previous prime is 404993593. The next prime is 404993623. The reversal of 404993609 is 906399404.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 404993609 - 2⁴ = 404993593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404993609.

It is not an unprimeable number, because it can be changed into a prime (404993639) 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, 1892387 + ... + 1892600.

It is an arithmetic number, because the mean of its divisors is an integer number (102194676).

Almost surely, 2^404993609 is an apocalyptic number.

It is an amenable number.

404993609 is a deficient number, since it is larger than the sum of its proper divisors (3785095).

404993609 is a wasteful number, since it uses less digits than its factorization.

404993609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785094.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 404993609 is about 20124.4530112001. The cubic root of 404993609 is about 739.8597305351.

The spelling of 404993609 in words is "four hundred four million, nine hundred ninety-three thousand, six hundred nine".