840785317 has 8 divisors (see below), whose sum is σ = 868250880. Its totient is φ = 813341280.

The previous prime is 840785293. The next prime is 840785333. The reversal of 840785317 is 713587048.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 840785317 - 2¹⁹ = 840261029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840785377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122934 + ... + 129592.

It is an arithmetic number, because the mean of its divisors is an integer number (108531360).

Almost surely, 2^840785317 is an apocalyptic number.

It is an amenable number.

840785317 is a deficient number, since it is larger than the sum of its proper divisors (27465563).

840785317 is a wasteful number, since it uses less digits than its factorization.

840785317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10763.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 840785317 is about 28996.2983327183. The cubic root of 840785317 is about 943.8327429931.

The spelling of 840785317 in words is "eight hundred forty million, seven hundred eighty-five thousand, three hundred seventeen".