9861138 has 48 divisors (see below), whose sum is σ = 24837696. Its totient is φ = 2769120.

The previous prime is 9861109. The next prime is 9861143. The reversal of 9861138 is 8311689.

9861138 is a `hidden beast` number, since 9 + 8 + 611 + 38 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7045 + ... + 8327.

It is an arithmetic number, because the mean of its divisors is an integer number (517452).

Almost surely, 2^9861138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9861138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12418848).

9861138 is an abundant number, since it is smaller than the sum of its proper divisors (14976558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9861138 is a wasteful number, since it uses less digits than its factorization.

9861138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359 (or 1356 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 9861138 is about 3140.2448949087. The cubic root of 9861138 is about 214.4415867806.

It can be divided in two parts, 9861 and 138, that added together give a palindrome (9999).

The spelling of 9861138 in words is "nine million, eight hundred sixty-one thousand, one hundred thirty-eight".