4091947 has 2 divisors, whose sum is σ = 4091948. Its totient is φ = 4091946.

The previous prime is 4091933. The next prime is 4091957. The reversal of 4091947 is 7491904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4091947 - 2¹⁹ = 3567659 is a prime.

It is not a weakly prime, because it can be changed into another prime (4091957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045973 + 2045974.

It is an arithmetic number, because the mean of its divisors is an integer number (2045974).

Almost surely, 2^4091947 is an apocalyptic number.

4091947 is a deficient number, since it is larger than the sum of its proper divisors (1).

4091947 is an equidigital number, since it uses as much as digits as its factorization.

4091947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 4091947 is about 2022.8561491119. The cubic root of 4091947 is about 159.9472091465.

The spelling of 4091947 in words is "four million, ninety-one thousand, nine hundred forty-seven".