9872861 has 4 divisors (see below), whose sum is σ = 9901500. Its totient is φ = 9844224.

The previous prime is 9872839. The next prime is 9872887. The reversal of 9872861 is 1682789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1682789 = 107 ⋅15727.

It can be written as a sum of positive squares in 2 ways, for example, as 8444836 + 1428025 = 2906^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 9872861 - 2¹⁴ = 9856477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9878861) 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, 13796 + ... + 14493.

It is an arithmetic number, because the mean of its divisors is an integer number (2475375).

Almost surely, 2^9872861 is an apocalyptic number.

It is an amenable number.

9872861 is a deficient number, since it is larger than the sum of its proper divisors (28639).

9872861 is a wasteful number, since it uses less digits than its factorization.

9872861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28638.

The product of its digits is 48384, while the sum is 41.

The square root of 9872861 is about 3142.1109146559. The cubic root of 9872861 is about 214.5265297556.

It can be divided in two parts, 98728 and 61, that added together give a palindrome (98789).

The spelling of 9872861 in words is "nine million, eight hundred seventy-two thousand, eight hundred sixty-one".