3978247 has 8 divisors (see below), whose sum is σ = 4896416. Its totient is φ = 3147552.

The previous prime is 3978229. The next prime is 3978253. The reversal of 3978247 is 7428793.

3978247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3978247 - 2¹¹ = 3976199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978217) 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 in 7 ways as a sum of consecutive naturals, for example, 21768 + ... + 21949.

It is an arithmetic number, because the mean of its divisors is an integer number (612052).

Almost surely, 2^3978247 is an apocalyptic number.

3978247 is a deficient number, since it is larger than the sum of its proper divisors (918169).

3978247 is a wasteful number, since it uses less digits than its factorization.

3978247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43737.

The product of its digits is 84672, while the sum is 40.

The square root of 3978247 is about 1994.5543361864. The cubic root of 3978247 is about 158.4518258595.

It can be divided in two parts, 3978 and 247, that added together give a square (4225 = 65²).

The spelling of 3978247 in words is "three million, nine hundred seventy-eight thousand, two hundred forty-seven".