8693721 has 6 divisors (see below), whose sum is σ = 12557610. Its totient is φ = 5795808.

The previous prime is 8693693. The next prime is 8693743. The reversal of 8693721 is 1273968.

8693721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7952400 + 741321 = 2820^2 + 861^2 .

It is not a de Polignac number, because 8693721 - 2⁵ = 8693689 is a prime.

8693721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8693771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 482976 + ... + 482993.

It is an arithmetic number, because the mean of its divisors is an integer number (2092935).

Almost surely, 2^8693721 is an apocalyptic number.

It is an amenable number.

8693721 is a deficient number, since it is larger than the sum of its proper divisors (3863889).

8693721 is a wasteful number, since it uses less digits than its factorization.

8693721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965975 (or 965972 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 8693721 is about 2948.5116584474. The cubic root of 8693721 is about 205.6215204678.

The spelling of 8693721 in words is "eight million, six hundred ninety-three thousand, seven hundred twenty-one".