3867421 has 2 divisors, whose sum is σ = 3867422. Its totient is φ = 3867420.

The previous prime is 3867401. The next prime is 3867433. The reversal of 3867421 is 1247683.

3867421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2839225 + 1028196 = 1685^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867421 - 2⁵ = 3867389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3867401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933710 + 1933711.

It is an arithmetic number, because the mean of its divisors is an integer number (1933711).

Almost surely, 2^3867421 is an apocalyptic number.

It is an amenable number.

3867421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867421 is an equidigital number, since it uses as much as digits as its factorization.

3867421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 3867421 is about 1966.5759583601. The cubic root of 3867421 is about 156.9665635315.

The spelling of 3867421 in words is "three million, eight hundred sixty-seven thousand, four hundred twenty-one".