9872686 has 4 divisors (see below), whose sum is σ = 14809032. Its totient is φ = 4936342.

The previous prime is 9872683. The next prime is 9872693. The reversal of 9872686 is 6862789.

9872686 = T₂₅₆₄ + T₂₅₆₅ + T₂₅₆₆.

9872686 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 an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9872683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2468170 + ... + 2468173.

It is an arithmetic number, because the mean of its divisors is an integer number (3702258).

Almost surely, 2^9872686 is an apocalyptic number.

9872686 is the 2566-th centered triangular number.

9872686 is a deficient number, since it is larger than the sum of its proper divisors (4936346).

9872686 is a wasteful number, since it uses less digits than its factorization.

9872686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936345.

The product of its digits is 290304, while the sum is 46.

The square root of 9872686 is about 3142.0830670114. The cubic root of 9872686 is about 214.5252622283.

The spelling of 9872686 in words is "nine million, eight hundred seventy-two thousand, six hundred eighty-six".