4427721 has 6 divisors (see below), whose sum is σ = 6395610. Its totient is φ = 2951808.

The previous prime is 4427719. The next prime is 4427723. The reversal of 4427721 is 1277244.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4427719) and next prime (4427723).

It can be written as a sum of positive squares in only one way, i.e., 3686400 + 741321 = 1920^2 + 861^2 .

It is not a de Polignac number, because 4427721 - 2¹ = 4427719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4427723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 245976 + ... + 245993.

It is an arithmetic number, because the mean of its divisors is an integer number (1065935).

Almost surely, 2^4427721 is an apocalyptic number.

It is an amenable number.

4427721 is a deficient number, since it is larger than the sum of its proper divisors (1967889).

4427721 is a wasteful number, since it uses less digits than its factorization.

4427721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491975 (or 491972 counting only the distinct ones).

The product of its digits is 3136, while the sum is 27.

The square root of 4427721 is about 2104.2150555492. The cubic root of 4427721 is about 164.2076612932.

The spelling of 4427721 in words is "four million, four hundred twenty-seven thousand, seven hundred twenty-one".