4265721 has 12 divisors (see below), whose sum is σ = 6204900. Its totient is φ = 2823840.

The previous prime is 4265719. The next prime is 4265731. The reversal of 4265721 is 1275624.

4265721 is a `hidden beast` number, since 4 + 2 + 657 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 404496 + 3861225 = 636^2 + 1965^2 .

It is not a de Polignac number, because 4265721 - 2¹ = 4265719 is a prime.

It is a Curzon number.

4265721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4265711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250 + ... + 2931.

It is an arithmetic number, because the mean of its divisors is an integer number (517075).

Almost surely, 2^4265721 is an apocalyptic number.

It is an amenable number.

4265721 is a deficient number, since it is larger than the sum of its proper divisors (1939179).

4265721 is a wasteful number, since it uses less digits than its factorization.

4265721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336 (or 3333 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 4265721 is about 2065.3621958388. The cubic root of 4265721 is about 162.1800695472.

The spelling of 4265721 in words is "four million, two hundred sixty-five thousand, seven hundred twenty-one".