2260721 has 4 divisors (see below), whose sum is σ = 2297844. Its totient is φ = 2223600.

The previous prime is 2260717. The next prime is 2260723. The reversal of 2260721 is 1270622.

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 970225 + 1290496 = 985^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2260721 - 2² = 2260717 is a prime.

It is a super-2 number, since 2×2260721² = 10221718879682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2260693 and 2260702.

It is not an unprimeable number, because it can be changed into a prime (2260723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18470 + ... + 18591.

It is an arithmetic number, because the mean of its divisors is an integer number (574461).

2^2260721 is an apocalyptic number.

It is an amenable number.

2260721 is a deficient number, since it is larger than the sum of its proper divisors (37123).

2260721 is an equidigital number, since it uses as much as digits as its factorization.

2260721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37122.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 2260721 is about 1503.5694197476. The cubic root of 2260721 is about 131.2448657100.

Subtracting from 2260721 its reverse (1270622), we obtain a palindrome (990099).

The spelling of 2260721 in words is "two million, two hundred sixty thousand, seven hundred twenty-one".