820915986 has 16 divisors (see below), whose sum is σ = 1791089568. Its totient is φ = 248762400.

The previous prime is 820915969. The next prime is 820915999. The reversal of 820915986 is 689519028.

It is a happy number.

820915986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6218995 + ... + 6219126.

It is an arithmetic number, because the mean of its divisors is an integer number (111943098).

Almost surely, 2^820915986 is an apocalyptic number.

820915986 is an abundant number, since it is smaller than the sum of its proper divisors (970173582).

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

820915986 is a wasteful number, since it uses less digits than its factorization.

820915986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438137.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 820915986 is about 28651.6314718726. The cubic root of 820915986 is about 936.3385504626.

The spelling of 820915986 in words is "eight hundred twenty million, nine hundred fifteen thousand, nine hundred eighty-six".