9861579 has 24 divisors (see below), whose sum is σ = 17533152. Its totient is φ = 5201280.

The previous prime is 9861571. The next prime is 9861583. The reversal of 9861579 is 9751689.

It is not a de Polignac number, because 9861579 - 2³ = 9861571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9861571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5202 + ... + 6839.

It is an arithmetic number, because the mean of its divisors is an integer number (730548).

Almost surely, 2^9861579 is an apocalyptic number.

9861579 is a deficient number, since it is larger than the sum of its proper divisors (7671573).

9861579 is a wasteful number, since it uses less digits than its factorization.

9861579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12067 (or 12064 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 9861579 is about 3140.3151115772. The cubic root of 9861579 is about 214.4447834140. Note that the first 3 decimals are identical.

It can be divided in two parts, 9861 and 579, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 9861579 in words is "nine million, eight hundred sixty-one thousand, five hundred seventy-nine".