3978943 has 8 divisors (see below), whose sum is σ = 4219520. Its totient is φ = 3745440.

The previous prime is 3978917. The next prime is 3978967. The reversal of 3978943 is 3498793.

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 3978943 - 2⁹ = 3978431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3978943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (527440).

Almost surely, 2^3978943 is an apocalyptic number.

3978943 is a deficient number, since it is larger than the sum of its proper divisors (240577).

3978943 is a wasteful number, since it uses less digits than its factorization.

3978943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537.

The product of its digits is 163296, while the sum is 43.

The square root of 3978943 is about 1994.7288036222. The cubic root of 3978943 is about 158.4610657785.

The spelling of 3978943 in words is "three million, nine hundred seventy-eight thousand, nine hundred forty-three".