3978744 has 64 divisors (see below), whose sum is σ = 12407040. Its totient is φ = 1032960.

The previous prime is 3978743. The next prime is 3978749. The reversal of 3978744 is 4478793.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 3978696 and 3978705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772 + ... + 2924.

It is an arithmetic number, because the mean of its divisors is an integer number (193860).

Almost surely, 2^3978744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3978744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6203520).

3978744 is an abundant number, since it is smaller than the sum of its proper divisors (8428296).

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

3978744 is a wasteful number, since it uses less digits than its factorization.

3978744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180 (or 2176 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 3978744 is about 1994.6789215310. The cubic root of 3978744 is about 158.4584240151.

The spelling of 3978744 in words is "three million, nine hundred seventy-eight thousand, seven hundred forty-four".