4821809 has 4 divisors (see below), whose sum is σ = 4859904. Its totient is φ = 4783716.

The previous prime is 4821799. The next prime is 4821821. The reversal of 4821809 is 9081284.

It is a happy number.

4821809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4821809 - 2⁴ = 4821793 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (4821889) 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, 18857 + ... + 19110.

It is an arithmetic number, because the mean of its divisors is an integer number (1214976).

Almost surely, 2^4821809 is an apocalyptic number.

It is an amenable number.

4821809 is a deficient number, since it is larger than the sum of its proper divisors (38095).

4821809 is a wasteful number, since it uses less digits than its factorization.

4821809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38094.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 4821809 is about 2195.8617898219. The cubic root of 4821809 is about 168.9416252061.

The spelling of 4821809 in words is "four million, eight hundred twenty-one thousand, eight hundred nine".