1782216 has 64 divisors (see below), whose sum is σ = 5107200. Its totient is φ = 575424.

The previous prime is 1782211. The next prime is 1782239. The reversal of 1782216 is 6122871.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1782216.

It is not an unprimeable number, because it can be changed into a prime (1782211) 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, 7881 + ... + 8103.

It is an arithmetic number, because the mean of its divisors is an integer number (79800).

2^1782216 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 1782216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2553600).

1782216 is an abundant number, since it is smaller than the sum of its proper divisors (3324984).

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

1782216 is a wasteful number, since it uses less digits than its factorization.

1782216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 265 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1782216 is about 1334.9966292092. The cubic root of 1782216 is about 121.2420988935.

The spelling of 1782216 in words is "one million, seven hundred eighty-two thousand, two hundred sixteen".