4489921 has 4 divisors (see below), whose sum is σ = 4754052. Its totient is φ = 4225792.

The previous prime is 4489897. The next prime is 4489937. The reversal of 4489921 is 1299844.

It is a happy number.

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 1476225 + 3013696 = 1215^2 + 1736^2 .

It is not a de Polignac number, because 4489921 - 2⁹ = 4489409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4489981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132040 + ... + 132073.

It is an arithmetic number, because the mean of its divisors is an integer number (1188513).

Almost surely, 2^4489921 is an apocalyptic number.

It is an amenable number.

4489921 is a deficient number, since it is larger than the sum of its proper divisors (264131).

4489921 is a wasteful number, since it uses less digits than its factorization.

4489921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264130.

The product of its digits is 20736, while the sum is 37.

The square root of 4489921 is about 2118.9433687572. The cubic root of 4489921 is about 164.9730105840.

The spelling of 4489921 in words is "four million, four hundred eighty-nine thousand, nine hundred twenty-one".