804894217 has 4 divisors (see below), whose sum is σ = 832649220. Its totient is φ = 777139216.

The previous prime is 804894197. The next prime is 804894229. The reversal of 804894217 is 712498408.

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 255648121 + 549246096 = 15989^2 + 23436^2 .

It is a de Polignac number, because none of the positive numbers 2^k-804894217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (804894617) 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, 13877458 + ... + 13877515.

It is an arithmetic number, because the mean of its divisors is an integer number (208162305).

Almost surely, 2^804894217 is an apocalyptic number.

It is an amenable number.

804894217 is a deficient number, since it is larger than the sum of its proper divisors (27755003).

804894217 is a wasteful number, since it uses less digits than its factorization.

804894217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27755002.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 804894217 is about 28370.6576765503. The cubic root of 804894217 is about 930.2069978976.

The spelling of 804894217 in words is "eight hundred four million, eight hundred ninety-four thousand, two hundred seventeen".