2291040 has 144 divisors (see below), whose sum is σ = 8216208. Its totient is φ = 580608.

The previous prime is 2291033. The next prime is 2291041. The reversal of 2291040 is 401922.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53259 + ... + 53301.

It is an arithmetic number, because the mean of its divisors is an integer number (57057).

2^2291040 is an apocalyptic number.

2291040 is a gapful number since it is divisible by the number (20) 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 2291040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4108104).

2291040 is an abundant number, since it is smaller than the sum of its proper divisors (5925168).

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

2291040 is a wasteful number, since it uses less digits than its factorization.

2291040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2291040 is about 1513.6181817090. The cubic root of 2291040 is about 131.8289796221.

Adding to 2291040 its reverse (401922), we get a palindrome (2692962).

The spelling of 2291040 in words is "two million, two hundred ninety-one thousand, forty".