8420647 has 8 divisors (see below), whose sum is σ = 8697744. Its totient is φ = 8147328.

The previous prime is 8420603. The next prime is 8420651. The reversal of 8420647 is 7460248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8420647 - 2⁷ = 8420519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3993 + ... + 5725.

It is an arithmetic number, because the mean of its divisors is an integer number (1087218).

Almost surely, 2^8420647 is an apocalyptic number.

8420647 is a deficient number, since it is larger than the sum of its proper divisors (277097).

8420647 is a wasteful number, since it uses less digits than its factorization.

8420647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 8420647 is about 2901.8351090301. The cubic root of 8420647 is about 203.4456869585.

The spelling of 8420647 in words is "eight million, four hundred twenty thousand, six hundred forty-seven".