8491806 has 24 divisors (see below), whose sum is σ = 19481904. Its totient is φ = 2664000.

The previous prime is 8491801. The next prime is 8491817. The reversal of 8491806 is 6081948.

It is a happy number.

It is a super-2 number, since 2×8491806² = 144221538283272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13570 + ... + 14181.

It is an arithmetic number, because the mean of its divisors is an integer number (811746).

Almost surely, 2^8491806 is an apocalyptic number.

8491806 is an abundant number, since it is smaller than the sum of its proper divisors (10990098).

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

8491806 is a wasteful number, since it uses less digits than its factorization.

8491806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27776 (or 27773 counting only the distinct ones).

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

The square root of 8491806 is about 2914.0703491851. The cubic root of 8491806 is about 204.0171554200.

The spelling of 8491806 in words is "eight million, four hundred ninety-one thousand, eight hundred six".