9997887 has 32 divisors (see below), whose sum is σ = 14902272. Its totient is φ = 5935104.

The previous prime is 9997879. The next prime is 9997913. The reversal of 9997887 is 7887999.

It is a happy number.

9997887 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9997887 - 2³ = 9997879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103023 + ... + 103119.

It is an arithmetic number, because the mean of its divisors is an integer number (465696).

Almost surely, 2^9997887 is an apocalyptic number.

9997887 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

9997887 is a deficient number, since it is larger than the sum of its proper divisors (4904385).

9997887 is a wasteful number, since it uses less digits than its factorization.

9997887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207.

The product of its digits is 2286144, while the sum is 57.

The square root of 9997887 is about 3161.9435478832. The cubic root of 9997887 is about 215.4282935326.

The spelling of 9997887 in words is "nine million, nine hundred ninety-seven thousand, eight hundred eighty-seven".