4442721 has 4 divisors (see below), whose sum is σ = 5923632. Its totient is φ = 2961812.

The previous prime is 4442689. The next prime is 4442743. The reversal of 4442721 is 1272444.

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 4442721 - 2⁵ = 4442689 is a prime.

It is a D-number.

4442721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4442691 and 4442700.

It is not an unprimeable number, because it can be changed into a prime (4442521) 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, 740451 + ... + 740456.

It is an arithmetic number, because the mean of its divisors is an integer number (1480908).

Almost surely, 2^4442721 is an apocalyptic number.

It is an amenable number.

4442721 is a deficient number, since it is larger than the sum of its proper divisors (1480911).

4442721 is a wasteful number, since it uses less digits than its factorization.

4442721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480910.

The product of its digits is 1792, while the sum is 24.

The square root of 4442721 is about 2107.7763164055. The cubic root of 4442721 is about 164.3928836436.

The spelling of 4442721 in words is "four million, four hundred forty-two thousand, seven hundred twenty-one".