9899686 has 4 divisors (see below), whose sum is σ = 14849532. Its totient is φ = 4949842.

The previous prime is 9899671. The next prime is 9899689. The reversal of 9899686 is 6869989.

9899686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2474920 + ... + 2474923.

It is an arithmetic number, because the mean of its divisors is an integer number (3712383).

Almost surely, 2^9899686 is an apocalyptic number.

9899686 is a deficient number, since it is larger than the sum of its proper divisors (4949846).

9899686 is a wasteful number, since it uses less digits than its factorization.

9899686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4949845.

The product of its digits is 1679616, while the sum is 55.

The square root of 9899686 is about 3146.3766462393. The cubic root of 9899686 is about 214.7206467434.

It can be divided in two parts, 9899 and 686, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 9899686 in words is "nine million, eight hundred ninety-nine thousand, six hundred eighty-six".