9969987 has 6 divisors (see below), whose sum is σ = 13300612. Its totient is φ = 6643012.

The previous prime is 9969959. The next prime is 9970001. The reversal of 9969987 is 7899699.

It is not a de Polignac number, because 9969987 - 2⁶ = 9969923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9969907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4558 + ... + 6380.

Almost surely, 2^9969987 is an apocalyptic number.

9969987 is a deficient number, since it is larger than the sum of its proper divisors (3330625).

9969987 is an frugal number, since it uses more digits than its factorization.

9969987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649 (or 1826 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 57.

The square root of 9969987 is about 3157.5286221981. The cubic root of 9969987 is about 215.2277161849.

The spelling of 9969987 in words is "nine million, nine hundred sixty-nine thousand, nine hundred eighty-seven".