842807217 has 16 divisors (see below), whose sum is σ = 1290371072. Its totient is φ = 479319120.

The previous prime is 842807191. The next prime is 842807237. The reversal of 842807217 is 712708248.

It is not a de Polignac number, because 842807217 - 2¹⁴ = 842790833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842807237) 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, 90673 + ... + 99534.

It is an arithmetic number, because the mean of its divisors is an integer number (80648192).

Almost surely, 2^842807217 is an apocalyptic number.

It is an amenable number.

842807217 is a deficient number, since it is larger than the sum of its proper divisors (447563855).

842807217 is a wasteful number, since it uses less digits than its factorization.

842807217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190428.

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 842807217 is about 29031.1421924801. The cubic root of 842807217 is about 944.5887059874.

The spelling of 842807217 in words is "eight hundred forty-two million, eight hundred seven thousand, two hundred seventeen".