1979745859 has 16 divisors (see below), whose sum is σ = 2439456768. Its totient is φ = 1564562592.

The previous prime is 1979745857. The next prime is 1979745877. The reversal of 1979745859 is 9585479791.

It is a cyclic number.

It is not a de Polignac number, because 1979745859 - 2¹ = 1979745857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1979745859.

It is not an unprimeable number, because it can be changed into a prime (1979745857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68454 + ... + 92980.

It is an arithmetic number, because the mean of its divisors is an integer number (152466048).

Almost surely, 2^1979745859 is an apocalyptic number.

1979745859 is a deficient number, since it is larger than the sum of its proper divisors (459710909).

1979745859 is a wasteful number, since it uses less digits than its factorization.

1979745859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25434.

The product of its digits is 28576800, while the sum is 64.

The square root of 1979745859 is about 44494.3351338123. The cubic root of 1979745859 is about 1255.6535083127.

It can be divided in two parts, 19797 and 45859, that added together give a palindrome (65656).

The spelling of 1979745859 in words is "one billion, nine hundred seventy-nine million, seven hundred forty-five thousand, eight hundred fifty-nine".