8996721 has 8 divisors (see below), whose sum is σ = 12102240. Its totient is φ = 5944512.

The previous prime is 8996717. The next prime is 8996759. The reversal of 8996721 is 1276998.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8996721 - 2² = 8996717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8996711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12931 + ... + 13608.

It is an arithmetic number, because the mean of its divisors is an integer number (1512780).

Almost surely, 2^8996721 is an apocalyptic number.

It is an amenable number.

8996721 is a deficient number, since it is larger than the sum of its proper divisors (3105519).

8996721 is a wasteful number, since it uses less digits than its factorization.

8996721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26655.

The product of its digits is 54432, while the sum is 42.

The square root of 8996721 is about 2999.4534502139. The cubic root of 8996721 is about 207.9831177743.

The spelling of 8996721 in words is "eight million, nine hundred ninety-six thousand, seven hundred twenty-one".