4267721 has 2 divisors, whose sum is σ = 4267722. Its totient is φ = 4267720.

The previous prime is 4267693. The next prime is 4267729. The reversal of 4267721 is 1277624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3610000 + 657721 = 1900^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 4267721 - 2⁶ = 4267657 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (4267729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2133860 + 2133861.

It is an arithmetic number, because the mean of its divisors is an integer number (2133861).

Almost surely, 2^4267721 is an apocalyptic number.

It is an amenable number.

4267721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4267721 is an equidigital number, since it uses as much as digits as its factorization.

4267721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 4267721 is about 2065.8463156779. The cubic root of 4267721 is about 162.2054118406.

The spelling of 4267721 in words is "four million, two hundred sixty-seven thousand, seven hundred twenty-one".