3868021 has 2 divisors, whose sum is σ = 3868022. Its totient is φ = 3868020.

The previous prime is 3868019. The next prime is 3868031. The reversal of 3868021 is 1208683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845521 + 22500 = 1961^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 3868021 - 2¹ = 3868019 is a prime.

Together with 3868019, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3868031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1934010 + 1934011.

It is an arithmetic number, because the mean of its divisors is an integer number (1934011).

Almost surely, 2^3868021 is an apocalyptic number.

It is an amenable number.

3868021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3868021 is an equidigital number, since it uses as much as digits as its factorization.

3868021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 3868021 is about 1966.7285018528. The cubic root of 3868021 is about 156.9746804883.

The spelling of 3868021 in words is "three million, eight hundred sixty-eight thousand, twenty-one".