8653721 has 8 divisors (see below), whose sum is σ = 9136320. Its totient is φ = 8173872.

The previous prime is 8653717. The next prime is 8653741. The reversal of 8653721 is 1273568.

It is a happy number.

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 8653721 - 2² = 8653717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8653741) 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, 11276 + ... + 12018.

It is an arithmetic number, because the mean of its divisors is an integer number (1142040).

Almost surely, 2^8653721 is an apocalyptic number.

It is an amenable number.

8653721 is a deficient number, since it is larger than the sum of its proper divisors (482599).

8653721 is a wasteful number, since it uses less digits than its factorization.

8653721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375.

The product of its digits is 10080, while the sum is 32.

The square root of 8653721 is about 2941.7207549324. The cubic root of 8653721 is about 205.3056792066.

The spelling of 8653721 in words is "eight million, six hundred fifty-three thousand, seven hundred twenty-one".