3978784 has 12 divisors (see below), whose sum is σ = 7833294. Its totient is φ = 1989376.

The previous prime is 3978781. The next prime is 3978803. The reversal of 3978784 is 4878793.

It can be written as a sum of positive squares in only one way, i.e., 3888784 + 90000 = 1972^2 + 300^2 .

It is not an unprimeable number, because it can be changed into a prime (3978781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62137 + ... + 62200.

Almost surely, 2^3978784 is an apocalyptic number.

It is an amenable number.

3978784 is a deficient number, since it is larger than the sum of its proper divisors (3854510).

3978784 is a wasteful number, since it uses less digits than its factorization.

3978784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124347 (or 124339 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 3978784 is about 1994.6889481821. The cubic root of 3978784 is about 158.4589550299.

Subtracting 3978784 from its reverse (4878793), we obtain a palindrome (900009).

The spelling of 3978784 in words is "three million, nine hundred seventy-eight thousand, seven hundred eighty-four".