9999897 has 8 divisors (see below), whose sum is σ = 13372800. Its totient is φ = 6646800.

The previous prime is 9999889. The next prime is 9999901. The reversal of 9999897 is 7989999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9999897 - 2³ = 9999889 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 9999897.

It is not an unprimeable number, because it can be changed into a prime (9999877) 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, 3729 + ... + 5822.

It is an arithmetic number, because the mean of its divisors is an integer number (1671600).

Almost surely, 2^9999897 is an apocalyptic number.

It is an amenable number.

9999897 is a deficient number, since it is larger than the sum of its proper divisors (3372903).

9999897 is a wasteful number, since it uses less digits than its factorization.

9999897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9903.

The product of its digits is 3306744, while the sum is 60.

The square root of 9999897 is about 3162.2613743965. The cubic root of 9999897 is about 215.4427293114.

The spelling of 9999897 in words is "nine million, nine hundred ninety-nine thousand, eight hundred ninety-seven".