3978118845 has 32 divisors (see below), whose sum is σ = 7077882240. Its totient is φ = 2119962240.

The previous prime is 3978118841. The next prime is 3978118861. The reversal of 3978118845 is 5488118793.

It is not a de Polignac number, because 3978118845 - 2² = 3978118841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3978118791 and 3978118800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978118841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167182 + ... + 189488.

It is an arithmetic number, because the mean of its divisors is an integer number (221183820).

Almost surely, 2^3978118845 is an apocalyptic number.

It is an amenable number.

3978118845 is a deficient number, since it is larger than the sum of its proper divisors (3099763395).

3978118845 is a wasteful number, since it uses less digits than its factorization.

3978118845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23642 (or 23636 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The square root of 3978118845 is about 63072.3302645463. The cubic root of 3978118845 is about 1584.5012438882.

The spelling of 3978118845 in words is "three billion, nine hundred seventy-eight million, one hundred eighteen thousand, eight hundred forty-five".