806986909 has 4 divisors (see below), whose sum is σ = 828797404. Its totient is φ = 785176416.

The previous prime is 806986903. The next prime is 806986913. The reversal of 806986909 is 909689608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 715402009 + 91584900 = 26747^2 + 9570^2 .

It is a cyclic number.

It is not a de Polignac number, because 806986909 - 2¹⁹ = 806462621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 806986909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806986903) 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 3 ways as a sum of consecutive naturals, for example, 10905192 + ... + 10905265.

It is an arithmetic number, because the mean of its divisors is an integer number (207199351).

Almost surely, 2^806986909 is an apocalyptic number.

It is an amenable number.

806986909 is a deficient number, since it is larger than the sum of its proper divisors (21810495).

806986909 is a wasteful number, since it uses less digits than its factorization.

806986909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21810494.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 806986909 is about 28407.5150092366. The cubic root of 806986909 is about 931.0124669376.

It can be divided in two parts, 806 and 986909, that added together give a triangular number (987715 = T₁₄₀₅).

The spelling of 806986909 in words is "eight hundred six million, nine hundred eighty-six thousand, nine hundred nine".