8521947 has 48 divisors (see below), whose sum is σ = 15238080. Its totient is φ = 4478976.

The previous prime is 8521939. The next prime is 8521949. The reversal of 8521947 is 7491258.

It is not a de Polignac number, because 8521947 - 2³ = 8521939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8521949) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78129 + ... + 78237.

It is an arithmetic number, because the mean of its divisors is an integer number (317460).

Almost surely, 2^8521947 is an apocalyptic number.

8521947 is a deficient number, since it is larger than the sum of its proper divisors (6716133).

8521947 is a wasteful number, since it uses less digits than its factorization.

8521947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 209 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 8521947 is about 2919.2374004181. The cubic root of 8521947 is about 204.2582513632.

The spelling of 8521947 in words is "eight million, five hundred twenty-one thousand, nine hundred forty-seven".