8859861 has 20 divisors (see below), whose sum is σ = 13394700. Its totient is φ = 5835456.

The previous prime is 8859857. The next prime is 8859863. The reversal of 8859861 is 1689588.

It can be written as a sum of positive squares in 2 ways, for example, as 5904900 + 2954961 = 2430^2 + 1719^2 .

It is not a de Polignac number, because 8859861 - 2² = 8859857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8859863) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 6595 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (669735).

Almost surely, 2^8859861 is an apocalyptic number.

8859861 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8859861 is a deficient number, since it is larger than the sum of its proper divisors (4534839).

8859861 is a wasteful number, since it uses less digits than its factorization.

8859861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1321 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 8859861 is about 2976.5518641542. The cubic root of 8859861 is about 206.9230968268.

The spelling of 8859861 in words is "eight million, eight hundred fifty-nine thousand, eight hundred sixty-one".