4781821 has 8 divisors (see below), whose sum is σ = 5264064. Its totient is φ = 4307520.

The previous prime is 4781807. The next prime is 4781831. The reversal of 4781821 is 1281874.

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

It is a cyclic number.

It is not a de Polignac number, because 4781821 - 2¹⁵ = 4749053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4781831) 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, 681 + ... + 3166.

It is an arithmetic number, because the mean of its divisors is an integer number (658008).

Almost surely, 2^4781821 is an apocalyptic number.

It is an amenable number.

4781821 is a deficient number, since it is larger than the sum of its proper divisors (482243).

4781821 is a wasteful number, since it uses less digits than its factorization.

4781821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971.

The product of its digits is 3584, while the sum is 31.

The square root of 4781821 is about 2186.7375242585. The cubic root of 4781821 is about 168.4733086187.

The spelling of 4781821 in words is "four million, seven hundred eighty-one thousand, eight hundred twenty-one".