8857861 has 4 divisors (see below), whose sum is σ = 8865324. Its totient is φ = 8850400.

The previous prime is 8857853. The next prime is 8857873. The reversal of 8857861 is 1687588.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1600225 + 7257636 = 1265^2 + 2694^2 .

It is a cyclic number.

It is not a de Polignac number, because 8857861 - 2³ = 8857853 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8857831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510 + ... + 4471.

It is an arithmetic number, because the mean of its divisors is an integer number (2216331).

Almost surely, 2^8857861 is an apocalyptic number.

It is an amenable number.

8857861 is a deficient number, since it is larger than the sum of its proper divisors (7463).

8857861 is a wasteful number, since it uses less digits than its factorization.

8857861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7462.

The product of its digits is 107520, while the sum is 43.

The square root of 8857861 is about 2976.2158859868. The cubic root of 8857861 is about 206.9075255766.

The spelling of 8857861 in words is "eight million, eight hundred fifty-seven thousand, eight hundred sixty-one".