8645861 has 16 divisors (see below), whose sum is σ = 10450944. Its totient is φ = 6992304.

The previous prime is 8645849. The next prime is 8645863. The reversal of 8645861 is 1685468.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8645861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8645863) 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, 13040 + ... + 13686.

It is an arithmetic number, because the mean of its divisors is an integer number (653184).

Almost surely, 2^8645861 is an apocalyptic number.

It is an amenable number.

8645861 is a deficient number, since it is larger than the sum of its proper divisors (1805083).

8645861 is a wasteful number, since it uses less digits than its factorization.

8645861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its digits is 46080, while the sum is 38.

The square root of 8645861 is about 2940.3844986668. The cubic root of 8645861 is about 205.2435020441.

The spelling of 8645861 in words is "eight million, six hundred forty-five thousand, eight hundred sixty-one".