8956721 has 4 divisors (see below), whose sum is σ = 9082944. Its totient is φ = 8830500.

The previous prime is 8956699. The next prime is 8956723. The reversal of 8956721 is 1276598.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8956721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8956723) 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, 63005 + ... + 63146.

It is an arithmetic number, because the mean of its divisors is an integer number (2270736).

Almost surely, 2^8956721 is an apocalyptic number.

It is an amenable number.

8956721 is a deficient number, since it is larger than the sum of its proper divisors (126223).

8956721 is a wasteful number, since it uses less digits than its factorization.

8956721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126222.

The product of its digits is 30240, while the sum is 38.

The square root of 8956721 is about 2992.7781407916. The cubic root of 8956721 is about 207.6744243932.

The spelling of 8956721 in words is "eight million, nine hundred fifty-six thousand, seven hundred twenty-one".