9856645 has 4 divisors (see below), whose sum is σ = 11827980. Its totient is φ = 7885312.

The previous prime is 9856633. The next prime is 9856697. The reversal of 9856645 is 5466589.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3932289 + 5924356 = 1983^2 + 2434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9856645 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985660 + ... + 985669.

It is an arithmetic number, because the mean of its divisors is an integer number (2956995).

Almost surely, 2^9856645 is an apocalyptic number.

It is an amenable number.

9856645 is a deficient number, since it is larger than the sum of its proper divisors (1971335).

9856645 is a wasteful number, since it uses less digits than its factorization.

9856645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971334.

The product of its digits is 259200, while the sum is 43.

The square root of 9856645 is about 3139.5294233372. The cubic root of 9856645 is about 214.4090133792.

It can be divided in two parts, 9856 and 645, that added together give a palindrome (10501).

The spelling of 9856645 in words is "nine million, eight hundred fifty-six thousand, six hundred forty-five".