3978820 has 12 divisors (see below), whose sum is σ = 8355564. Its totient is φ = 1591520.

The previous prime is 3978817. The next prime is 3978823. The reversal of 3978820 is 288793.

3978820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3978817) and next prime (3978823).

It can be written as a sum of positive squares in 2 ways, for example, as 3147076 + 831744 = 1774^2 + 912^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3978820.

It is not an unprimeable number, because it can be changed into a prime (3978823) 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 3 ways as a sum of consecutive naturals, for example, 99451 + ... + 99490.

It is an arithmetic number, because the mean of its divisors is an integer number (696297).

Almost surely, 2^3978820 is an apocalyptic number.

It is an amenable number.

3978820 is an abundant number, since it is smaller than the sum of its proper divisors (4376744).

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

3978820 is a wasteful number, since it uses less digits than its factorization.

3978820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198950 (or 198948 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 3978820 is about 1994.6979721251. The cubic root of 3978820 is about 158.4594329402.

The spelling of 3978820 in words is "three million, nine hundred seventy-eight thousand, eight hundred twenty".