3978947 has 6 divisors (see below), whose sum is σ = 4628628. Its totient is φ = 3410484.

The previous prime is 3978917. The next prime is 3978967. The reversal of 3978947 is 7498793.

It is not a de Polignac number, because 3978947 - 2⁶ = 3978883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3978917) 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 5 ways as a sum of consecutive naturals, for example, 40553 + ... + 40650.

It is an arithmetic number, because the mean of its divisors is an integer number (771438).

Almost surely, 2^3978947 is an apocalyptic number.

3978947 is a deficient number, since it is larger than the sum of its proper divisors (649681).

3978947 is an equidigital number, since it uses as much as digits as its factorization.

3978947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81217 (or 81210 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 3978947 is about 1994.7298062645. The cubic root of 3978947 is about 158.4611188784.

The spelling of 3978947 in words is "three million, nine hundred seventy-eight thousand, nine hundred forty-seven".