3978190813 has 4 divisors (see below), whose sum is σ = 3984832800. Its totient is φ = 3971548828.

The previous prime is 3978190789. The next prime is 3978190829. The reversal of 3978190813 is 3180918793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3978190813 - 2⁹ = 3978190301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978190313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3320095 + ... + 3321292.

It is an arithmetic number, because the mean of its divisors is an integer number (996208200).

Almost surely, 2^3978190813 is an apocalyptic number.

It is an amenable number.

3978190813 is a deficient number, since it is larger than the sum of its proper divisors (6641987).

3978190813 is an equidigital number, since it uses as much as digits as its factorization.

3978190813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6641986.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 3978190813 is about 63072.9007815559. The cubic root of 3978190813 is about 1584.5107988816.

The spelling of 3978190813 in words is "three billion, nine hundred seventy-eight million, one hundred ninety thousand, eight hundred thirteen".