9980865 has 12 divisors (see below), whose sum is σ = 17300244. Its totient is φ = 5323104.

The previous prime is 9980863. The next prime is 9980869. The reversal of 9980865 is 5680899.

It can be written as a sum of positive squares in 2 ways, for example, as 1354896 + 8625969 = 1164^2 + 2937^2 .

It is not a de Polignac number, because 9980865 - 2¹ = 9980863 is a prime.

It is a super-2 number, since 2×9980865² = 199235332296450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 221797 = 9980865 / (9 + 9 + 8 + 0 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 9980865.

It is not an unprimeable number, because it can be changed into a prime (9980863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110854 + ... + 110943.

It is an arithmetic number, because the mean of its divisors is an integer number (1441687).

Almost surely, 2^9980865 is an apocalyptic number.

It is an amenable number.

9980865 is a deficient number, since it is larger than the sum of its proper divisors (7319379).

9980865 is a wasteful number, since it uses less digits than its factorization.

9980865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221808 (or 221805 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 9980865 is about 3159.2507023027. The cubic root of 9980865 is about 215.3059642348.

The spelling of 9980865 in words is "nine million, nine hundred eighty thousand, eight hundred sixty-five".