3940891 has 2 divisors, whose sum is σ = 3940892. Its totient is φ = 3940890.

The previous prime is 3940841. The next prime is 3940931. The reversal of 3940891 is 1980493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3940891 - 2⁷ = 3940763 is a prime.

It is not a weakly prime, because it can be changed into another prime (3940801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1970445 + 1970446.

It is an arithmetic number, because the mean of its divisors is an integer number (1970446).

Almost surely, 2^3940891 is an apocalyptic number.

3940891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3940891 is an equidigital number, since it uses as much as digits as its factorization.

3940891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 3940891 is about 1985.1677510981. The cubic root of 3940891 is about 157.9543076762.

The spelling of 3940891 in words is "three million, nine hundred forty thousand, eight hundred ninety-one".