9900997 has 4 divisors (see below), whose sum is σ = 10220416. Its totient is φ = 9581580.

The previous prime is 9900959. The next prime is 9901007. The reversal of 9900997 is 7990099.

9900997 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7990099 = 13 ⋅614623.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9900997 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 (9900907) 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, 159663 + ... + 159724.

It is an arithmetic number, because the mean of its divisors is an integer number (2555104).

Almost surely, 2^9900997 is an apocalyptic number.

It is an amenable number.

9900997 is a deficient number, since it is larger than the sum of its proper divisors (319419).

9900997 is a wasteful number, since it uses less digits than its factorization.

9900997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319418.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 9900997 is about 3146.5849742221. The cubic root of 9900997 is about 214.7301246986.

The spelling of 9900997 in words is "nine million, nine hundred thousand, nine hundred ninety-seven".