1801216 has 22 divisors (see below), whose sum is σ = 3602720. Its totient is φ = 900096.

The previous prime is 1801213. The next prime is 1801223. The reversal of 1801216 is 6121081.

It is a junction number, because it is equal to n+sod(n) for n = 1801193 and 1801202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145 + ... + 1903.

It is an arithmetic number, because the mean of its divisors is an integer number (163760).

2^1801216 is an apocalyptic number.

1801216 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 1801216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1801360).

1801216 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1801216 is an equidigital number, since it uses as much as digits as its factorization.

1801216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779 (or 1761 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1801216 is about 1342.0938864327. The cubic root of 1801216 is about 121.6714261811.

Adding to 1801216 its reverse (6121081), we get a palindrome (7922297).

The spelling of 1801216 in words is "one million, eight hundred one thousand, two hundred sixteen".