3922978 has 4 divisors (see below), whose sum is σ = 5884470. Its totient is φ = 1961488.

The previous prime is 3922973. The next prime is 3922979. The reversal of 3922978 is 8792293.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2537649 + 1385329 = 1593^2 + 1177^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 3922978.

It is not an unprimeable number, because it can be changed into a prime (3922973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980743 + ... + 980746.

Almost surely, 2^3922978 is an apocalyptic number.

3922978 is a deficient number, since it is larger than the sum of its proper divisors (1961492).

3922978 is a wasteful number, since it uses less digits than its factorization.

3922978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961491.

The product of its digits is 54432, while the sum is 40.

The square root of 3922978 is about 1980.6509031124. The cubic root of 3922978 is about 157.7146213242.

It can be divided in two parts, 3922 and 978, that added together give a square (4900 = 70²).

The spelling of 3922978 in words is "three million, nine hundred twenty-two thousand, nine hundred seventy-eight".