9997986 has 16 divisors (see below), whose sum is σ = 20143584. Its totient is φ = 3308064.

The previous prime is 9997969. The next prime is 9997987. The reversal of 9997986 is 6897999.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9997987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5260 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (1258974).

Almost surely, 2^9997986 is an apocalyptic number.

9997986 is an abundant number, since it is smaller than the sum of its proper divisors (10145598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9997986 is a wasteful number, since it uses less digits than its factorization.

9997986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12305.

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

The square root of 9997986 is about 3161.9592027729. The cubic root of 9997986 is about 215.4290045939.

The spelling of 9997986 in words is "nine million, nine hundred ninety-seven thousand, nine hundred eighty-six".