8721347 has 4 divisors (see below), whose sum is σ = 9100560. Its totient is φ = 8342136.

The previous prime is 8721329. The next prime is 8721359. The reversal of 8721347 is 7431278.

It is a happy number.

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 8721347 - 2²² = 4527043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8720347) 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, 189572 + ... + 189617.

It is an arithmetic number, because the mean of its divisors is an integer number (2275140).

Almost surely, 2^8721347 is an apocalyptic number.

8721347 is a deficient number, since it is larger than the sum of its proper divisors (379213).

8721347 is a wasteful number, since it uses less digits than its factorization.

8721347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379212.

The product of its digits is 9408, while the sum is 32.

The square root of 8721347 is about 2953.1926791187. The cubic root of 8721347 is about 205.8390910477.

The spelling of 8721347 in words is "eight million, seven hundred twenty-one thousand, three hundred forty-seven".