3978706 has 4 divisors (see below), whose sum is σ = 5968062. Its totient is φ = 1989352.

The previous prime is 3978683. The next prime is 3978707. The reversal of 3978706 is 6078793.

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

It can be written as a sum of positive squares in only one way, i.e., 2223081 + 1755625 = 1491^2 + 1325^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3978707) 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 as a sum of consecutive naturals, namely, 994675 + ... + 994678.

Almost surely, 2^3978706 is an apocalyptic number.

3978706 is a deficient number, since it is larger than the sum of its proper divisors (1989356).

3978706 is a wasteful number, since it uses less digits than its factorization.

3978706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989355.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 3978706 is about 1994.6693961657. The cubic root of 3978706 is about 158.4579195478.

The spelling of 3978706 in words is "three million, nine hundred seventy-eight thousand, seven hundred six".