3909491 has 2 divisors, whose sum is σ = 3909492. Its totient is φ = 3909490.

The previous prime is 3909481. The next prime is 3909509. The reversal of 3909491 is 1949093.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3909491 - 2⁶ = 3909427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3909401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1954745 + 1954746.

It is an arithmetic number, because the mean of its divisors is an integer number (1954746).

Almost surely, 2^3909491 is an apocalyptic number.

3909491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909491 is an equidigital number, since it uses as much as digits as its factorization.

3909491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 3909491 is about 1977.2432829574. The cubic root of 3909491 is about 157.5336755069.

The spelling of 3909491 in words is "three million, nine hundred nine thousand, four hundred ninety-one".