3978520 has 64 divisors (see below), whose sum is σ = 11027520. Its totient is φ = 1257984.

The previous prime is 3978511. The next prime is 3978523. The reversal of 3978520 is 258793.

3978520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3094 + ... + 4186.

It is an arithmetic number, because the mean of its divisors is an integer number (172305).

Almost surely, 2^3978520 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 3978520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5513760).

3978520 is an abundant number, since it is smaller than the sum of its proper divisors (7049000).

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

3978520 is a wasteful number, since it uses less digits than its factorization.

3978520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 3978520 is about 1994.6227713530. The cubic root of 3978520 is about 158.4554502665.

The spelling of 3978520 in words is "three million, nine hundred seventy-eight thousand, five hundred twenty".