2299721 has 4 divisors (see below), whose sum is σ = 2305152. Its totient is φ = 2294292.

The previous prime is 2299711. The next prime is 2299727. The reversal of 2299721 is 1279922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2299721 - 2⁶ = 2299657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2299727) 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, 2021 + ... + 2946.

It is an arithmetic number, because the mean of its divisors is an integer number (576288).

2^2299721 is an apocalyptic number.

It is an amenable number.

2299721 is a deficient number, since it is larger than the sum of its proper divisors (5431).

2299721 is an equidigital number, since it uses as much as digits as its factorization.

2299721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5430.

The product of its digits is 4536, while the sum is 32.

The square root of 2299721 is about 1516.4831024446. The cubic root of 2299721 is about 131.9952745477.

The spelling of 2299721 in words is "two million, two hundred ninety-nine thousand, seven hundred twenty-one".