840549216 has 144 divisors (see below), whose sum is σ = 2417216256. Its totient is φ = 255610368.

The previous prime is 840549211. The next prime is 840549247. The reversal of 840549216 is 612945048.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840549211) 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, 1670821 + ... + 1671323.

It is an arithmetic number, because the mean of its divisors is an integer number (16786224).

Almost surely, 2^840549216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840549216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208608128).

840549216 is an abundant number, since it is smaller than the sum of its proper divisors (1576667040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840549216 is a wasteful number, since it uses less digits than its factorization.

840549216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 840549216 is about 28992.2268203048. The cubic root of 840549216 is about 943.7443888034.

The spelling of 840549216 in words is "eight hundred forty million, five hundred forty-nine thousand, two hundred sixteen".