8491860 has 144 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 1969920.

The previous prime is 8491831. The next prime is 8491897. The reversal of 8491860 is 681948.

It is a happy number.

It is a super-2 number, since 2×8491860² = 144223372519200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44365 + ... + 44555.

It is an arithmetic number, because the mean of its divisors is an integer number (203840).

Almost surely, 2^8491860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8491860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14676480).

8491860 is an abundant number, since it is smaller than the sum of its proper divisors (20861100).

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

8491860 is a wasteful number, since it uses less digits than its factorization.

8491860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 8491860 is about 2914.0796145610. The cubic root of 8491860 is about 204.0175878723.

The spelling of 8491860 in words is "eight million, four hundred ninety-one thousand, eight hundred sixty".