904747409 has 4 divisors (see below), whose sum is σ = 905239104. Its totient is φ = 904255716.

The previous prime is 904747399. The next prime is 904747427.

904747409 is nontrivially palindromic in base 10.

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 904747409 - 2²⁰ = 903698833 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 904747409.

It is not an unprimeable number, because it can be changed into a prime (904747469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243077 + ... + 246770.

It is an arithmetic number, because the mean of its divisors is an integer number (226309776).

Almost surely, 2^904747409 is an apocalyptic number.

It is an amenable number.

904747409 is a deficient number, since it is larger than the sum of its proper divisors (491695).

904747409 is a wasteful number, since it uses less digits than its factorization.

904747409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491694.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 904747409 is about 30079.0194155328. The cubic root of 904747409 is about 967.1840280257.

The spelling of 904747409 in words is "nine hundred four million, seven hundred forty-seven thousand, four hundred nine".