2306721 has 8 divisors (see below), whose sum is σ = 3114880. Its totient is φ = 1518192.

The previous prime is 2306677. The next prime is 2306737. The reversal of 2306721 is 1276032.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2306721 - 2¹⁸ = 2044577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2306761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4630 + ... + 5103.

It is an arithmetic number, because the mean of its divisors is an integer number (389360).

2^2306721 is an apocalyptic number.

It is an amenable number.

2306721 is a deficient number, since it is larger than the sum of its proper divisors (808159).

2306721 is an equidigital number, since it uses as much as digits as its factorization.

2306721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9815.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 2306721 is about 1518.7893204787. The cubic root of 2306721 is about 132.1290633903.

The spelling of 2306721 in words is "two million, three hundred six thousand, seven hundred twenty-one".