3978506 has 12 divisors (see below), whose sum is σ = 6942258. Its totient is φ = 1705032.

The previous prime is 3978497. The next prime is 3978511. The reversal of 3978506 is 6058793.

3978506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 1713481 = 1505^2 + 1309^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3978506.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 20201 + ... + 20396.

Almost surely, 2^3978506 is an apocalyptic number.

3978506 is a deficient number, since it is larger than the sum of its proper divisors (2963752).

3978506 is a wasteful number, since it uses less digits than its factorization.

3978506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40613 (or 40606 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 3978506 is about 1994.6192619144. The cubic root of 3978506 is about 158.4552644035.

The spelling of 3978506 in words is "three million, nine hundred seventy-eight thousand, five hundred six".