4978821 has 8 divisors (see below), whose sum is σ = 6673600. Its totient is φ = 3301632.

The previous prime is 4978801. The next prime is 4978829. The reversal of 4978821 is 1288794.

4978821 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4978821 - 2¹¹ = 4976773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4978821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4978829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3721 + ... + 4878.

It is an arithmetic number, because the mean of its divisors is an integer number (834200).

Almost surely, 2^4978821 is an apocalyptic number.

It is an amenable number.

4978821 is a deficient number, since it is larger than the sum of its proper divisors (1694779).

4978821 is a wasteful number, since it uses less digits than its factorization.

4978821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8795.

The product of its digits is 32256, while the sum is 39.

The square root of 4978821 is about 2231.3271835390. The cubic root of 4978821 is about 170.7558157661.

The spelling of 4978821 in words is "four million, nine hundred seventy-eight thousand, eight hundred twenty-one".