2271816 has 48 divisors (see below), whose sum is σ = 6224400. Its totient is φ = 748512.

The previous prime is 2271799. The next prime is 2271817. The reversal of 2271816 is 6181722.

It is a super-2 number, since 2×2271816² = 10322295875712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2271816.

It is not an unprimeable number, because it can be changed into a prime (2271817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9895 + ... + 10121.

It is an arithmetic number, because the mean of its divisors is an integer number (129675).

2^2271816 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 2271816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3112200).

2271816 is an abundant number, since it is smaller than the sum of its proper divisors (3952584).

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

2271816 is a wasteful number, since it uses less digits than its factorization.

2271816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 371 counting only the distinct ones).

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

The square root of 2271816 is about 1507.2544576149. The cubic root of 2271816 is about 131.4592200555.

The spelling of 2271816 in words is "two million, two hundred seventy-one thousand, eight hundred sixteen".