1085815986 has 16 divisors (see below), whose sum is σ = 2230325184. Its totient is φ = 352156464.

The previous prime is 1085815981. The next prime is 1085815987. The reversal of 1085815986 is 6895185801.

It is not an unprimeable number, because it can be changed into a prime (1085815981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2445310 + ... + 2445753.

It is an arithmetic number, because the mean of its divisors is an integer number (139395324).

Almost surely, 2^1085815986 is an apocalyptic number.

1085815986 is an abundant number, since it is smaller than the sum of its proper divisors (1144509198).

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

1085815986 is a wasteful number, since it uses less digits than its factorization.

1085815986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891105.

The product of its (nonzero) digits is 691200, while the sum is 51.

The square root of 1085815986 is about 32951.7220490827. The cubic root of 1085815986 is about 1027.8239748924.

It can be divided in two parts, 1085815 and 986, that added together give a palindrome (1086801).

The spelling of 1085815986 in words is "one billion, eighty-five million, eight hundred fifteen thousand, nine hundred eighty-six".