489844821 has 4 divisors (see below), whose sum is σ = 653126432. Its totient is φ = 326563212.

The previous prime is 489844807. The next prime is 489844837. The reversal of 489844821 is 128448984.

It is a happy number.

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 not a de Polignac number, because 489844821 - 2¹³ = 489836629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489844891) 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, 81640801 + ... + 81640806.

It is an arithmetic number, because the mean of its divisors is an integer number (163281608).

Almost surely, 2^489844821 is an apocalyptic number.

It is an amenable number.

489844821 is a deficient number, since it is larger than the sum of its proper divisors (163281611).

489844821 is a wasteful number, since it uses less digits than its factorization.

489844821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163281610.

The product of its digits is 589824, while the sum is 48.

The square root of 489844821 is about 22132.4382073011. The cubic root of 489844821 is about 788.2902837046.

The spelling of 489844821 in words is "four hundred eighty-nine million, eight hundred forty-four thousand, eight hundred twenty-one".