9994721 has 6 divisors (see below), whose sum is σ = 10986066. Its totient is φ = 9086000.

The previous prime is 9994717. The next prime is 9994727. The reversal of 9994721 is 1274999.

It is a happy number.

9994721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7623121 + 2371600 = 2761^2 + 1540^2 .

It is not a de Polignac number, because 9994721 - 2² = 9994717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9994727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41180 + ... + 41421.

It is an arithmetic number, because the mean of its divisors is an integer number (1831011).

Almost surely, 2^9994721 is an apocalyptic number.

It is an amenable number.

9994721 is a deficient number, since it is larger than the sum of its proper divisors (991345).

9994721 is a wasteful number, since it uses less digits than its factorization.

9994721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82623 (or 82612 counting only the distinct ones).

The product of its digits is 40824, while the sum is 41.

The square root of 9994721 is about 3161.4428667936. The cubic root of 9994721 is about 215.4055514611.

The spelling of 9994721 in words is "nine million, nine hundred ninety-four thousand, seven hundred twenty-one".