1979795647 has 4 divisors (see below), whose sum is σ = 1980404176. Its totient is φ = 1979187120.

The previous prime is 1979795627. The next prime is 1979795689. The reversal of 1979795647 is 7465979791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979795647 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 (1979795627) 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, 299358 + ... + 305899.

It is an arithmetic number, because the mean of its divisors is an integer number (495101044).

Almost surely, 2^1979795647 is an apocalyptic number.

1979795647 is a deficient number, since it is larger than the sum of its proper divisors (608529).

1979795647 is an equidigital number, since it uses as much as digits as its factorization.

1979795647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608528.

The product of its digits is 30005640, while the sum is 64.

The square root of 1979795647 is about 44494.8946172479. The cubic root of 1979795647 is about 1255.6640342349.

The spelling of 1979795647 in words is "one billion, nine hundred seventy-nine million, seven hundred ninety-five thousand, six hundred forty-seven".