8942721 has 16 divisors (see below), whose sum is σ = 12230400. Its totient is φ = 5810688.

The previous prime is 8942671. The next prime is 8942741. The reversal of 8942721 is 1272498.

It is a happy number.

8942721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-8942721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8942741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22795 + ... + 23183.

It is an arithmetic number, because the mean of its divisors is an integer number (764400).

Almost surely, 2^8942721 is an apocalyptic number.

It is an amenable number.

8942721 is a deficient number, since it is larger than the sum of its proper divisors (3287679).

8942721 is a wasteful number, since it uses less digits than its factorization.

8942721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568.

The product of its digits is 8064, while the sum is 33.

The square root of 8942721 is about 2990.4382621950. The cubic root of 8942721 is about 207.5661646068.

The spelling of 8942721 in words is "eight million, nine hundred forty-two thousand, seven hundred twenty-one".