9907897 has 4 divisors (see below), whose sum is σ = 10175716. Its totient is φ = 9640080.

The previous prime is 9907867. The next prime is 9907901. The reversal of 9907897 is 7987099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6610041 + 3297856 = 2571^2 + 1816^2 .

It is a cyclic number.

It is not a de Polignac number, because 9907897 - 2⁷ = 9907769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9907897.

It is not an unprimeable number, because it can be changed into a prime (9907847) 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, 133854 + ... + 133927.

It is an arithmetic number, because the mean of its divisors is an integer number (2543929).

Almost surely, 2^9907897 is an apocalyptic number.

It is an amenable number.

9907897 is a deficient number, since it is larger than the sum of its proper divisors (267819).

9907897 is a wasteful number, since it uses less digits than its factorization.

9907897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267818.

The product of its (nonzero) digits is 285768, while the sum is 49.

The square root of 9907897 is about 3147.6812100338. The cubic root of 9907897 is about 214.7799948888.

The spelling of 9907897 in words is "nine million, nine hundred seven thousand, eight hundred ninety-seven".