3978705 has 8 divisors (see below), whose sum is σ = 6365952. Its totient is φ = 2121968.

The previous prime is 3978683. The next prime is 3978707. The reversal of 3978705 is 5078793.

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 3978705 - 2⁵ = 3978673 is a prime.

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 in 7 ways as a sum of consecutive naturals, for example, 132609 + ... + 132638.

It is an arithmetic number, because the mean of its divisors is an integer number (795744).

Almost surely, 2^3978705 is an apocalyptic number.

It is an amenable number.

3978705 is a deficient number, since it is larger than the sum of its proper divisors (2387247).

3978705 is a wasteful number, since it uses less digits than its factorization.

3978705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265255.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 3978705 is about 1994.6691454976. The cubic root of 3978705 is about 158.4579062723.

The spelling of 3978705 in words is "three million, nine hundred seventy-eight thousand, seven hundred five".