1979988943 has 4 divisors (see below), whose sum is σ = 1984458888. Its totient is φ = 1975519000.

The previous prime is 1979988937. The next prime is 1979988961. The reversal of 1979988943 is 3498899791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3498899791 = 11731 ⋅298261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979988943 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 (1979988343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234308 + ... + 2235193.

It is an arithmetic number, because the mean of its divisors is an integer number (496114722).

Almost surely, 2^1979988943 is an apocalyptic number.

1979988943 is a deficient number, since it is larger than the sum of its proper divisors (4469945).

1979988943 is an equidigital number, since it uses as much as digits as its factorization.

1979988943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469944.

The product of its digits is 35271936, while the sum is 67.

The square root of 1979988943 is about 44497.0666786025. The cubic root of 1979988943 is about 1255.7048982061.

The spelling of 1979988943 in words is "one billion, nine hundred seventy-nine million, nine hundred eighty-eight thousand, nine hundred forty-three".