2291856 has 80 divisors (see below), whose sum is σ = 7142400. Its totient is φ = 618624.

The previous prime is 2291851. The next prime is 2291867. The reversal of 2291856 is 6581922.

It is not an unprimeable number, because it can be changed into a prime (2291851) 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, 6205 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (89280).

2^2291856 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 2291856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3571200).

2291856 is an abundant number, since it is smaller than the sum of its proper divisors (4850544).

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

2291856 is a wasteful number, since it uses less digits than its factorization.

2291856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 390 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 2291856 is about 1513.8877104990. The cubic root of 2291856 is about 131.8446289456.

The spelling of 2291856 in words is "two million, two hundred ninety-one thousand, eight hundred fifty-six".