404920609 has 4 divisors (see below), whose sum is σ = 426232240. Its totient is φ = 383608980.

The previous prime is 404920601. The next prime is 404920627. The reversal of 404920609 is 906029404.

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 404920609 - 2³ = 404920601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404920601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10655787 + ... + 10655824.

It is an arithmetic number, because the mean of its divisors is an integer number (106558060).

Almost surely, 2^404920609 is an apocalyptic number.

It is an amenable number.

404920609 is a deficient number, since it is larger than the sum of its proper divisors (21311631).

404920609 is a wasteful number, since it uses less digits than its factorization.

404920609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21311630.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 404920609 is about 20122.6392155701. The cubic root of 404920609 is about 739.8152746848.

The spelling of 404920609 in words is "four hundred four million, nine hundred twenty thousand, six hundred nine".