9889997 has 4 divisors (see below), whose sum is σ = 10650780. Its totient is φ = 9129216.

The previous prime is 9889987. The next prime is 9890009. The reversal of 9889997 is 7999889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7999889 = 1723 ⋅4643.

It can be written as a sum of positive squares in 2 ways, for example, as 5621641 + 4268356 = 2371^2 + 2066^2 .

It is a cyclic number.

It is not a de Polignac number, because 9889997 - 2⁴ = 9889981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9889927) 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 3 ways as a sum of consecutive naturals, for example, 380372 + ... + 380397.

It is an arithmetic number, because the mean of its divisors is an integer number (2662695).

Almost surely, 2^9889997 is an apocalyptic number.

It is an amenable number.

9889997 is a deficient number, since it is larger than the sum of its proper divisors (760783).

9889997 is a wasteful number, since it uses less digits than its factorization.

9889997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760782.

The product of its digits is 2939328, while the sum is 59.

The square root of 9889997 is about 3144.8365617310. The cubic root of 9889997 is about 214.6505735635.

The spelling of 9889997 in words is "nine million, eight hundred eighty-nine thousand, nine hundred ninety-seven".