8927721 has 24 divisors (see below), whose sum is σ = 14526720. Its totient is φ = 5234400.

The previous prime is 8927717. The next prime is 8927741. The reversal of 8927721 is 1277298.

It is not a de Polignac number, because 8927721 - 2² = 8927717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8927741) 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 23 ways as a sum of consecutive naturals, for example, 1615 + ... + 4523.

It is an arithmetic number, because the mean of its divisors is an integer number (605280).

Almost surely, 2^8927721 is an apocalyptic number.

It is an amenable number.

8927721 is a deficient number, since it is larger than the sum of its proper divisors (5598999).

8927721 is a wasteful number, since it uses less digits than its factorization.

8927721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957 (or 2954 counting only the distinct ones).

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

The square root of 8927721 is about 2987.9292160291. The cubic root of 8927721 is about 207.4500465226.

It can be divided in two parts, 89277 and 21, that added together give a palindrome (89298).

The spelling of 8927721 in words is "eight million, nine hundred twenty-seven thousand, seven hundred twenty-one".