9871965 has 12 divisors (see below), whose sum is σ = 17111484. Its totient is φ = 5265024.

The previous prime is 9871957. The next prime is 9871973. The reversal of 9871965 is 5691789.

9871965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9871957) and next prime (9871973).

It can be written as a sum of positive squares in 2 ways, for example, as 3790809 + 6081156 = 1947^2 + 2466^2 .

It is not a de Polignac number, because 9871965 - 2³ = 9871957 is a prime.

It is a super-2 number, since 2×9871965² = 194911385922450, 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: 219377 = 9871965 / (9 + 8 + 7 + 1 + 9 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 9871965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109644 + ... + 109733.

It is an arithmetic number, because the mean of its divisors is an integer number (1425957).

Almost surely, 2^9871965 is an apocalyptic number.

It is an amenable number.

9871965 is a deficient number, since it is larger than the sum of its proper divisors (7239519).

9871965 is a wasteful number, since it uses less digits than its factorization.

9871965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219388 (or 219385 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 9871965 is about 3141.9683321128. The cubic root of 9871965 is about 214.5200398575.

The spelling of 9871965 in words is "nine million, eight hundred seventy-one thousand, nine hundred sixty-five".