3978860445 has 24 divisors (see below), whose sum is σ = 7881933696. Its totient is φ = 1818907488.

The previous prime is 3978860441. The next prime is 3978860491. The reversal of 3978860445 is 5440688793.

It is not a de Polignac number, because 3978860445 - 2² = 3978860441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3978860391 and 3978860400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978860441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6315337 + ... + 6315966.

It is an arithmetic number, because the mean of its divisors is an integer number (328413904).

Almost surely, 2^3978860445 is an apocalyptic number.

3978860445 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3978860445 is a deficient number, since it is larger than the sum of its proper divisors (3903073251).

3978860445 is a wasteful number, since it uses less digits than its factorization.

3978860445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12631321 (or 12631318 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The square root of 3978860445 is about 63078.2089552327. The cubic root of 3978860445 is about 1584.5996985563.

The spelling of 3978860445 in words is "three billion, nine hundred seventy-eight million, eight hundred sixty thousand, four hundred forty-five".