3978668793 has 32 divisors (see below), whose sum is σ = 5980326912. Its totient is φ = 2331633600.

The previous prime is 3978668791. The next prime is 3978668809.

It is a happy number.

3978668793 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3978668793 - 2¹ = 3978668791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3978668791) 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, 189028 + ... + 209018.

It is an arithmetic number, because the mean of its divisors is an integer number (186885216).

Almost surely, 2^3978668793 is an apocalyptic number.

3978668793 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3978668793 is a deficient number, since it is larger than the sum of its proper divisors (2001658119).

3978668793 is a wasteful number, since it uses less digits than its factorization.

3978668793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20205.

The product of its digits is 82301184, while the sum is 66.

The square root of 3978668793 is about 63076.6897752252. The cubic root of 3978668793 is about 1584.5742560474.

The spelling of 3978668793 in words is "three billion, nine hundred seventy-eight million, six hundred sixty-eight thousand, seven hundred ninety-three".