3850921 has 2 divisors, whose sum is σ = 3850922. Its totient is φ = 3850920.

The previous prime is 3850909. The next prime is 3850937. The reversal of 3850921 is 1290583.

3850921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3013696 + 837225 = 1736^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 3850921 - 2²¹ = 1753769 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 3850921.

It is not a weakly prime, because it can be changed into another prime (3850981) 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, 1925460 + 1925461.

It is an arithmetic number, because the mean of its divisors is an integer number (1925461).

Almost surely, 2^3850921 is an apocalyptic number.

It is an amenable number.

3850921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3850921 is an equidigital number, since it uses as much as digits as its factorization.

3850921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 3850921 is about 1962.3763655324. The cubic root of 3850921 is about 156.7430174601.

The spelling of 3850921 in words is "three million, eight hundred fifty thousand, nine hundred twenty-one".