840830217 has 24 divisors (see below), whose sum is σ = 1220105376. Its totient is φ = 513278208.

The previous prime is 840830203. The next prime is 840830219. The reversal of 840830217 is 712038048.

It is not a de Polignac number, because 840830217 - 2⁶ = 840830153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840830219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63798 + ... + 75840.

It is an arithmetic number, because the mean of its divisors is an integer number (50837724).

Almost surely, 2^840830217 is an apocalyptic number.

It is an amenable number.

840830217 is a deficient number, since it is larger than the sum of its proper divisors (379275159).

840830217 is a wasteful number, since it uses less digits than its factorization.

840830217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12137 (or 12100 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 840830217 is about 28997.0725591395. The cubic root of 840830217 is about 943.8495436892.

The spelling of 840830217 in words is "eight hundred forty million, eight hundred thirty thousand, two hundred seventeen".