3809947 has 2 divisors, whose sum is σ = 3809948. Its totient is φ = 3809946.

The previous prime is 3809941. The next prime is 3809957. The reversal of 3809947 is 7499083.

3809947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (7499083) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3809947 is a prime.

It is a super-2 number, since 2×3809947² = 29031392285618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3809941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1904973 + 1904974.

It is an arithmetic number, because the mean of its divisors is an integer number (1904974).

Almost surely, 2^3809947 is an apocalyptic number.

3809947 is a deficient number, since it is larger than the sum of its proper divisors (1).

3809947 is an equidigital number, since it uses as much as digits as its factorization.

3809947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 3809947 is about 1951.9085531858. The cubic root of 3809947 is about 156.1851161002.

The spelling of 3809947 in words is "three million, eight hundred nine thousand, nine hundred forty-seven".