4859821 has 2 divisors, whose sum is σ = 4859822. Its totient is φ = 4859820.

The previous prime is 4859819. The next prime is 4859837. The reversal of 4859821 is 1289584.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4778596 + 81225 = 2186^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 4859821 - 2¹ = 4859819 is a prime.

Together with 4859819, it forms a pair of twin primes.

It is a Chen prime.

It is the 2205-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4859861) by changing a digit.

It is a nontrivial repunit in base 2204.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2429910 + 2429911.

It is an arithmetic number, because the mean of its divisors is an integer number (2429911).

Almost surely, 2^4859821 is an apocalyptic number.

It is an amenable number.

4859821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4859821 is an equidigital number, since it uses as much as digits as its factorization.

4859821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 4859821 is about 2204.5001701066. The cubic root of 4859821 is about 169.3844055996.

The spelling of 4859821 in words is "four million, eight hundred fifty-nine thousand, eight hundred twenty-one".