3978842 has 16 divisors (see below), whose sum is σ = 6937920. Its totient is φ = 1675968.

The previous prime is 3978841. The next prime is 3978859. The reversal of 3978842 is 2488793.

It is a self number, because there is not a number n which added to its sum of digits gives 3978842.

It is not an unprimeable number, because it can be changed into a prime (3978841) 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, 1583 + ... + 3234.

It is an arithmetic number, because the mean of its divisors is an integer number (433620).

Almost surely, 2^3978842 is an apocalyptic number.

3978842 is a deficient number, since it is larger than the sum of its proper divisors (2959078).

3978842 is a wasteful number, since it uses less digits than its factorization.

3978842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4885.

The product of its digits is 96768, while the sum is 41.

The square root of 3978842 is about 1994.7034867368. The cubic root of 3978842 is about 158.4597249950.

The spelling of 3978842 in words is "three million, nine hundred seventy-eight thousand, eight hundred forty-two".