2240921 has 4 divisors (see below), whose sum is σ = 2246244. Its totient is φ = 2235600.

The previous prime is 2240891. The next prime is 2240941. The reversal of 2240921 is 1290422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1466521 + 774400 = 1211^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 2240921 - 2⁶ = 2240857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2240893 and 2240902.

It is not an unprimeable number, because it can be changed into a prime (2240941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1970 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (561561).

2^2240921 is an apocalyptic number.

It is an amenable number.

2240921 is a deficient number, since it is larger than the sum of its proper divisors (5323).

2240921 is an equidigital number, since it uses as much as digits as its factorization.

2240921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2240921 is about 1496.9706075939. The cubic root of 2240921 is about 130.8605824032.

The spelling of 2240921 in words is "two million, two hundred forty thousand, nine hundred twenty-one".