8792721 has 24 divisors (see below), whose sum is σ = 14601600. Its totient is φ = 4994496.

The previous prime is 8792699. The next prime is 8792761. The reversal of 8792721 is 1272978.

8792721 is a nontrivial binomial coefficient, being equal to C(4194, 2).

It is not a de Polignac number, because 8792721 - 2⁶ = 8792657 is a prime.

It is a Curzon number.

8792721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8792761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14380 + ... + 14978.

It is an arithmetic number, because the mean of its divisors is an integer number (608400).

Almost surely, 2^8792721 is an apocalyptic number.

8792721 is the 4193-rd triangular number and also the 2097-th hexagonal number.

It is an amenable number.

8792721 is a deficient number, since it is larger than the sum of its proper divisors (5808879).

8792721 is a wasteful number, since it uses less digits than its factorization.

8792721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 842 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 8792721 is about 2965.2522658283. The cubic root of 8792721 is about 206.3990833969.

It can be divided in two parts, 879 and 2721, that added together give a square (3600 = 60²).

The spelling of 8792721 in words is "eight million, seven hundred ninety-two thousand, seven hundred twenty-one".