3978505 has 8 divisors (see below), whose sum is σ = 5025600. Its totient is φ = 3015216.

The previous prime is 3978497. The next prime is 3978511. The reversal of 3978505 is 5058793.

3978505 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 3978505 - 2³ = 3978497 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 20845 + ... + 21034.

It is an arithmetic number, because the mean of its divisors is an integer number (628200).

Almost surely, 2^3978505 is an apocalyptic number.

It is an amenable number.

3978505 is a deficient number, since it is larger than the sum of its proper divisors (1047095).

3978505 is a wasteful number, since it uses less digits than its factorization.

3978505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41903.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 3978505 is about 1994.6190112400. The cubic root of 3978505 is about 158.4552511276.

The spelling of 3978505 in words is "three million, nine hundred seventy-eight thousand, five hundred five".