8491647 has 16 divisors (see below), whose sum is σ = 11652480. Its totient is φ = 5498592.

The previous prime is 8491643. The next prime is 8491663. The reversal of 8491647 is 7461948.

It is a happy number.

8491647 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8491647 - 2² = 8491643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16429 + ... + 16937.

It is an arithmetic number, because the mean of its divisors is an integer number (728280).

Almost surely, 2^8491647 is an apocalyptic number.

8491647 is a deficient number, since it is larger than the sum of its proper divisors (3160833).

8491647 is a wasteful number, since it uses less digits than its factorization.

8491647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662.

The product of its digits is 48384, while the sum is 39.

The square root of 8491647 is about 2914.0430676296. The cubic root of 8491647 is about 204.0158820776.

The spelling of 8491647 in words is "eight million, four hundred ninety-one thousand, six hundred forty-seven".