9899657 has 4 divisors (see below), whose sum is σ = 10110336. Its totient is φ = 9688980.

The previous prime is 9899651. The next prime is 9899663. The reversal of 9899657 is 7569989.

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.

It is an interprime number because it is at equal distance from previous prime (9899651) and next prime (9899663).

It is a cyclic number.

It is not a de Polignac number, because 9899657 - 2⁴ = 9899641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9899599 and 9899608.

It is not an unprimeable number, because it can be changed into a prime (9899651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105269 + ... + 105362.

It is an arithmetic number, because the mean of its divisors is an integer number (2527584).

Almost surely, 2^9899657 is an apocalyptic number.

It is an amenable number.

9899657 is a deficient number, since it is larger than the sum of its proper divisors (210679).

9899657 is a wasteful number, since it uses less digits than its factorization.

9899657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210678.

The product of its digits is 1224720, while the sum is 53.

The square root of 9899657 is about 3146.3720377603. The cubic root of 9899657 is about 214.7204370766.

The spelling of 9899657 in words is "nine million, eight hundred ninety-nine thousand, six hundred fifty-seven".