3905491 has 2 divisors, whose sum is σ = 3905492. Its totient is φ = 3905490.

The previous prime is 3905477. The next prime is 3905501. The reversal of 3905491 is 1945093.

It is a strong prime.

It is an emirp because it is prime and its reverse (1945093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3905491 - 2¹¹ = 3903443 is a prime.

It is not a weakly prime, because it can be changed into another prime (3905441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1952745 + 1952746.

It is an arithmetic number, because the mean of its divisors is an integer number (1952746).

Almost surely, 2^3905491 is an apocalyptic number.

3905491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3905491 is an equidigital number, since it uses as much as digits as its factorization.

3905491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 3905491 is about 1976.2315147776. The cubic root of 3905491 is about 157.4799302553.

The spelling of 3905491 in words is "three million, nine hundred five thousand, four hundred ninety-one".