2261808 has 60 divisors (see below), whose sum is σ = 6431880. Its totient is φ = 741888.

The previous prime is 2261807. The next prime is 2261827. The reversal of 2261808 is 8081622.

It is not an unprimeable number, because it can be changed into a prime (2261801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16203 + ... + 16341.

It is an arithmetic number, because the mean of its divisors is an integer number (107198).

2^2261808 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 2261808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3215940).

2261808 is an abundant number, since it is smaller than the sum of its proper divisors (4170072).

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

2261808 is a wasteful number, since it uses less digits than its factorization.

2261808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 2261808 is about 1503.9308494741. The cubic root of 2261808 is about 131.2658973941.

The spelling of 2261808 in words is "two million, two hundred sixty-one thousand, eight hundred eight".