4282721 has 4 divisors (see below), whose sum is σ = 4298244. Its totient is φ = 4267200.

The previous prime is 4282711. The next prime is 4282723. The reversal of 4282721 is 1272824.

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 3150625 + 1132096 = 1775^2 + 1064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4282721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4282723) 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, 7340 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (1074561).

Almost surely, 2^4282721 is an apocalyptic number.

It is an amenable number.

4282721 is a deficient number, since it is larger than the sum of its proper divisors (15523).

4282721 is a wasteful number, since it uses less digits than its factorization.

4282721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15522.

The product of its digits is 1792, while the sum is 26.

The square root of 4282721 is about 2069.4736045671. The cubic root of 4282721 is about 162.3952271361.

The spelling of 4282721 in words is "four million, two hundred eighty-two thousand, seven hundred twenty-one".