8505869 has 4 divisors (see below), whose sum is σ = 8549244. Its totient is φ = 8462496.

The previous prime is 8505859. The next prime is 8505881. The reversal of 8505869 is 9685058.

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 7155625 + 1350244 = 2675^2 + 1162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8505869 is a prime.

It is a super-2 number, since 2×8505869² = 144699614890322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8505859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21392 + ... + 21785.

It is an arithmetic number, because the mean of its divisors is an integer number (2137311).

Almost surely, 2^8505869 is an apocalyptic number.

It is an amenable number.

8505869 is a deficient number, since it is larger than the sum of its proper divisors (43375).

8505869 is a wasteful number, since it uses less digits than its factorization.

8505869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43374.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 8505869 is about 2916.4822989348. The cubic root of 8505869 is about 204.1297153360.

The spelling of 8505869 in words is "eight million, five hundred five thousand, eight hundred sixty-nine".