9891645 has 16 divisors (see below), whose sum is σ = 16096320. Its totient is φ = 5185664.

The previous prime is 9891613. The next prime is 9891653. The reversal of 9891645 is 5461989.

9891645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9891645 - 2⁵ = 9891613 is a prime.

It is a super-3 number, since 3×9891645³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9891597 and 9891606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4704 + ... + 6473.

It is an arithmetic number, because the mean of its divisors is an integer number (1006020).

Almost surely, 2^9891645 is an apocalyptic number.

It is an amenable number.

9891645 is a deficient number, since it is larger than the sum of its proper divisors (6204675).

9891645 is a wasteful number, since it uses less digits than its factorization.

9891645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11244.

The product of its digits is 77760, while the sum is 42.

The square root of 9891645 is about 3145.0985676128. The cubic root of 9891645 is about 214.6624955253.

The spelling of 9891645 in words is "nine million, eight hundred ninety-one thousand, six hundred forty-five".