9861690 has 32 divisors (see below), whose sum is σ = 23774976. Its totient is φ = 2617920.

The previous prime is 9861679. The next prime is 9861697. The reversal of 9861690 is 961689.

It is a super-2 number, since 2×9861690² = 194505859312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9861697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7524 + ... + 8736.

It is an arithmetic number, because the mean of its divisors is an integer number (742968).

Almost surely, 2^9861690 is an apocalyptic number.

9861690 is an abundant number, since it is smaller than the sum of its proper divisors (13913286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9861690 is a wasteful number, since it uses less digits than its factorization.

9861690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 9861690 is about 3140.3327849131. The cubic root of 9861690 is about 214.4455879938.

The spelling of 9861690 in words is "nine million, eight hundred sixty-one thousand, six hundred ninety".