8487721 has 8 divisors (see below), whose sum is σ = 9345600. Its totient is φ = 7644240.

The previous prime is 8487719. The next prime is 8487751. The reversal of 8487721 is 1277848.

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 8487721 - 2¹ = 8487719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8487701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2341 + ... + 4738.

It is an arithmetic number, because the mean of its divisors is an integer number (1168200).

Almost surely, 2^8487721 is an apocalyptic number.

It is an amenable number.

8487721 is a deficient number, since it is larger than the sum of its proper divisors (857879).

8487721 is a wasteful number, since it uses less digits than its factorization.

8487721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7199.

The product of its digits is 25088, while the sum is 37.

The square root of 8487721 is about 2913.3693552312. The cubic root of 8487721 is about 203.9844358881.

The spelling of 8487721 in words is "eight million, four hundred eighty-seven thousand, seven hundred twenty-one".