2291840 has 32 divisors (see below), whose sum is σ = 5480460. Its totient is φ = 916480.

The previous prime is 2291827. The next prime is 2291851. The reversal of 2291840 is 481922.

It can be written as a sum of positive squares in 2 ways, for example, as 2238016 + 53824 = 1496^2 + 232^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151 + ... + 2430.

2^2291840 is an apocalyptic number.

2291840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2291840 is an abundant number, since it is smaller than the sum of its proper divisors (3188620).

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

2291840 is an equidigital number, since it uses as much as digits as its factorization.

2291840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600 (or 3588 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2291840 is about 1513.8824260820. The cubic root of 2291840 is about 131.8443221318.

The spelling of 2291840 in words is "two million, two hundred ninety-one thousand, eight hundred forty".