3994947 has 16 divisors (see below), whose sum is σ = 6456960. Its totient is φ = 2421000.

The previous prime is 3994937. The next prime is 3994961. The reversal of 3994947 is 7494993.

It is not a de Polignac number, because 3994947 - 2⁴ = 3994931 is a prime.

3994947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3994937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6429 + ... + 7022.

It is an arithmetic number, because the mean of its divisors is an integer number (403560).

Almost surely, 2^3994947 is an apocalyptic number.

3994947 is a deficient number, since it is larger than the sum of its proper divisors (2462013).

3994947 is a wasteful number, since it uses less digits than its factorization.

3994947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13471 (or 13465 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 3994947 is about 1998.7363507977. The cubic root of 3994947 is about 158.6732342180.

The spelling of 3994947 in words is "three million, nine hundred ninety-four thousand, nine hundred forty-seven".