3978864 has 30 divisors (see below), whose sum is σ = 11135696. Its totient is φ = 1326240.

The previous prime is 3978859. The next prime is 3978883. The reversal of 3978864 is 4688793.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13672 + ... + 13959.

Almost surely, 2^3978864 is an apocalyptic number.

It is an amenable number.

3978864 is an abundant number, since it is smaller than the sum of its proper divisors (7156832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3978864 is a wasteful number, since it uses less digits than its factorization.

3978864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27645 (or 27636 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 3978864 is about 1994.7090013333. The cubic root of 3978864 is about 158.4600170488.

It can be divided in two parts, 397 and 8864, that added together give a cube (9261 = 21³).

The spelling of 3978864 in words is "three million, nine hundred seventy-eight thousand, eight hundred sixty-four".