9899659 has 16 divisors (see below), whose sum is σ = 12499200. Its totient is φ = 7616160.

The previous prime is 9899651. The next prime is 9899663. The reversal of 9899659 is 9569989.

9899659 = 1282² + 1283² + ... + 1287².

9899659 is digitally balanced in base 2, base 3 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9899659 - 2³ = 9899651 is a prime.

It is an Ulam number.

9899659 is strictly pandigital in base 8.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5617 + ... + 7165.

It is an arithmetic number, because the mean of its divisors is an integer number (781200).

Almost surely, 2^9899659 is an apocalyptic number.

9899659 is a deficient number, since it is larger than the sum of its proper divisors (2599541).

9899659 is a wasteful number, since it uses less digits than its factorization.

9899659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650.

The product of its digits is 1574640, while the sum is 55.

The square root of 9899659 is about 3146.3723555867. The cubic root of 9899659 is about 214.7204515364.

It can be divided in two parts, 989 and 9659, that added together give a cube (10648 = 22³).

The spelling of 9899659 in words is "nine million, eight hundred ninety-nine thousand, six hundred fifty-nine".