8491787 has 4 divisors (see below), whose sum is σ = 8548176. Its totient is φ = 8435400.

The previous prime is 8491753. The next prime is 8491801. The reversal of 8491787 is 7871948.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8491787 - 2⁶ = 8491723 is a prime.

It is a super-2 number, since 2×8491787² = 144220892906738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8491487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27968 + ... + 28269.

It is an arithmetic number, because the mean of its divisors is an integer number (2137044).

Almost surely, 2^8491787 is an apocalyptic number.

8491787 is a deficient number, since it is larger than the sum of its proper divisors (56389).

8491787 is a wasteful number, since it uses less digits than its factorization.

8491787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56388.

The product of its digits is 112896, while the sum is 44.

The square root of 8491787 is about 2914.0670891385. The cubic root of 8491787 is about 204.0170032604.

The spelling of 8491787 in words is "eight million, four hundred ninety-one thousand, seven hundred eighty-seven".