3981947 has 4 divisors (see below), whose sum is σ = 4023096. Its totient is φ = 3940800.

The previous prime is 3981937. The next prime is 3981953. The reversal of 3981947 is 7491893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3981947 - 2⁶ = 3981883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981917) 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 3 ways as a sum of consecutive naturals, for example, 20429 + ... + 20622.

It is an arithmetic number, because the mean of its divisors is an integer number (1005774).

Almost surely, 2^3981947 is an apocalyptic number.

3981947 is a deficient number, since it is larger than the sum of its proper divisors (41149).

3981947 is an equidigital number, since it uses as much as digits as its factorization.

3981947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41148.

The product of its digits is 54432, while the sum is 41.

The square root of 3981947 is about 1995.4816461196. The cubic root of 3981947 is about 158.5009337617.

The spelling of 3981947 in words is "three million, nine hundred eighty-one thousand, nine hundred forty-seven".