9891864 has 24 divisors (see below), whose sum is σ = 26790660. Its totient is φ = 3297264.

The previous prime is 9891853. The next prime is 9891877. The reversal of 9891864 is 4681989.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68622 + ... + 68765.

Almost surely, 2^9891864 is an apocalyptic number.

It is an amenable number.

9891864 is an abundant number, since it is smaller than the sum of its proper divisors (16898796).

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

9891864 is a wasteful number, since it uses less digits than its factorization.

9891864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137399 (or 137392 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 9891864 is about 3145.1333834990. The cubic root of 9891864 is about 214.6640797154.

The spelling of 9891864 in words is "nine million, eight hundred ninety-one thousand, eight hundred sixty-four".