1791216 has 60 divisors (see below), whose sum is σ = 5732272. Its totient is φ = 511488.

The previous prime is 1791203. The next prime is 1791221. The reversal of 1791216 is 6121971.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1791216.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120 + ... + 1896.

2^1791216 is an apocalyptic number.

1791216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1791216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2866136).

1791216 is an abundant number, since it is smaller than the sum of its proper divisors (3941056).

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

1791216 is a wasteful number, since it uses less digits than its factorization.

1791216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798 (or 1789 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 1791216 is about 1338.3631794098. The cubic root of 1791216 is about 121.4458428555.

The spelling of 1791216 in words is "one million, seven hundred ninety-one thousand, two hundred sixteen".