1791985986 has 48 divisors (see below), whose sum is σ = 4487184000. Its totient is φ = 506240064.

The previous prime is 1791985981. The next prime is 1791986003. The reversal of 1791985986 is 6895891971.

It is a super-2 number, since 2×1791985986² = 6422427548040784392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1791985981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68686 + ... + 91113.

It is an arithmetic number, because the mean of its divisors is an integer number (93483000).

Almost surely, 2^1791985986 is an apocalyptic number.

1791985986 is an abundant number, since it is smaller than the sum of its proper divisors (2695198014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1791985986 is a wasteful number, since it uses less digits than its factorization.

1791985986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159903 (or 159900 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 63.

The square root of 1791985986 is about 42331.8554518934. The cubic root of 1791985986 is about 1214.6324224654.

It can be divided in two parts, 1791985 and 986, that added together give a palindrome (1792971).

The spelling of 1791985986 in words is "one billion, seven hundred ninety-one million, nine hundred eighty-five thousand, nine hundred eighty-six".