3828821 has 2 divisors, whose sum is σ = 3828822. Its totient is φ = 3828820.

The previous prime is 3828751. The next prime is 3828857. The reversal of 3828821 is 1288283.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3783025 + 45796 = 1945^2 + 214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3828821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3828521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1914410 + 1914411.

It is an arithmetic number, because the mean of its divisors is an integer number (1914411).

Almost surely, 2^3828821 is an apocalyptic number.

It is an amenable number.

3828821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3828821 is an equidigital number, since it uses as much as digits as its factorization.

3828821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 32.

The square root of 3828821 is about 1956.7373354643. The cubic root of 3828821 is about 156.4425985529.

The spelling of 3828821 in words is "three million, eight hundred twenty-eight thousand, eight hundred twenty-one".