8491872 has 48 divisors (see below), whose sum is σ = 22725360. Its totient is φ = 2775552.

The previous prime is 8491831. The next prime is 8491897. The reversal of 8491872 is 2781948.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×8491872² = 144223780128768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8491872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4254 + ... + 5922.

It is an arithmetic number, because the mean of its divisors is an integer number (473445).

Almost surely, 2^8491872 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 8491872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11362680).

8491872 is an abundant number, since it is smaller than the sum of its proper divisors (14233488).

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

8491872 is a wasteful number, since it uses less digits than its factorization.

8491872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735 (or 1727 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 8491872 is about 2914.0816735294. The cubic root of 8491872 is about 204.0176839726.

The spelling of 8491872 in words is "eight million, four hundred ninety-one thousand, eight hundred seventy-two".