3982978 has 4 divisors (see below), whose sum is σ = 5974470. Its totient is φ = 1991488.

The previous prime is 3982967. The next prime is 3982987. The reversal of 3982978 is 8792893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8792893 = 17 ⋅517229.

It can be written as a sum of positive squares in only one way, i.e., 2259009 + 1723969 = 1503^2 + 1313^2 .

It is a super-2 number, since 2×3982978² = 31728227496968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995743 + ... + 995746.

Almost surely, 2^3982978 is an apocalyptic number.

3982978 is a deficient number, since it is larger than the sum of its proper divisors (1991492).

3982978 is a wasteful number, since it uses less digits than its factorization.

3982978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991491.

The product of its digits is 217728, while the sum is 46.

The square root of 3982978 is about 1995.7399630212. The cubic root of 3982978 is about 158.5146121926.

The spelling of 3982978 in words is "three million, nine hundred eighty-two thousand, nine hundred seventy-eight".