9965987 has 4 divisors (see below), whose sum is σ = 10235376. Its totient is φ = 9696600.

The previous prime is 9965959. The next prime is 9966001. The reversal of 9965987 is 7895699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7895699 = 7 ⋅1127957.

It is a cyclic number.

It is not a de Polignac number, because 9965987 - 2⁸ = 9965731 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (9965947) 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, 134639 + ... + 134712.

It is an arithmetic number, because the mean of its divisors is an integer number (2558844).

Almost surely, 2^9965987 is an apocalyptic number.

9965987 is a deficient number, since it is larger than the sum of its proper divisors (269389).

9965987 is a wasteful number, since it uses less digits than its factorization.

9965987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269388.

The product of its digits is 1224720, while the sum is 53.

The square root of 9965987 is about 3156.8951518858. The cubic root of 9965987 is about 215.1989289182.

The spelling of 9965987 in words is "nine million, nine hundred sixty-five thousand, nine hundred eighty-seven".