3946391 has 2 divisors, whose sum is σ = 3946392. Its totient is φ = 3946390.

The previous prime is 3946387. The next prime is 3946399. The reversal of 3946391 is 1936493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3946391 - 2² = 3946387 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3946399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973195 + 1973196.

It is an arithmetic number, because the mean of its divisors is an integer number (1973196).

Almost surely, 2^3946391 is an apocalyptic number.

3946391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3946391 is an equidigital number, since it uses as much as digits as its factorization.

3946391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 35.

The square root of 3946391 is about 1986.5525414647. The cubic root of 3946391 is about 158.0277550985.

The spelling of 3946391 in words is "three million, nine hundred forty-six thousand, three hundred ninety-one".