8399443217 has 16 divisors (see below), whose sum is σ = 9512830080. Its totient is φ = 7346236800.

The previous prime is 8399443187. The next prime is 8399443243. The reversal of 8399443217 is 7123449938.

It is a cyclic number.

It is not a de Polignac number, because 8399443217 - 2⁶ = 8399443153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8399443277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42788 + ... + 136490.

It is an arithmetic number, because the mean of its divisors is an integer number (594551880).

Almost surely, 2^8399443217 is an apocalyptic number.

It is an amenable number.

8399443217 is a deficient number, since it is larger than the sum of its proper divisors (1113386863).

8399443217 is a wasteful number, since it uses less digits than its factorization.

8399443217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94024.

The product of its digits is 1306368, while the sum is 50.

The square root of 8399443217 is about 91648.4763484915. The cubic root of 8399443217 is about 2032.7477989696.

The spelling of 8399443217 in words is "eight billion, three hundred ninety-nine million, four hundred forty-three thousand, two hundred seventeen".