8799721 has 4 divisors (see below), whose sum is σ = 10056832. Its totient is φ = 7542612.

The previous prime is 8799719. The next prime is 8799733. The reversal of 8799721 is 1279978.

It is a happy number.

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 not a de Polignac number, because 8799721 - 2¹ = 8799719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8799701) 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 3 ways as a sum of consecutive naturals, for example, 628545 + ... + 628558.

It is an arithmetic number, because the mean of its divisors is an integer number (2514208).

Almost surely, 2^8799721 is an apocalyptic number.

It is an amenable number.

8799721 is a deficient number, since it is larger than the sum of its proper divisors (1257111).

8799721 is a wasteful number, since it uses less digits than its factorization.

8799721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257110.

The product of its digits is 63504, while the sum is 43.

The square root of 8799721 is about 2966.4323690251. The cubic root of 8799721 is about 206.4538412034.

The spelling of 8799721 in words is "eight million, seven hundred ninety-nine thousand, seven hundred twenty-one".