9347721 has 4 divisors (see below), whose sum is σ = 12463632. Its totient is φ = 6231812.

The previous prime is 9347707. The next prime is 9347747. The reversal of 9347721 is 1277439.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1277439 = 3 ⋅425813.

It is a cyclic number.

It is not a de Polignac number, because 9347721 - 2⁷ = 9347593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9347321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557951 + ... + 1557956.

It is an arithmetic number, because the mean of its divisors is an integer number (3115908).

Almost surely, 2^9347721 is an apocalyptic number.

It is an amenable number.

9347721 is a deficient number, since it is larger than the sum of its proper divisors (3115911).

9347721 is a wasteful number, since it uses less digits than its factorization.

9347721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115910.

The product of its digits is 10584, while the sum is 33.

The square root of 9347721 is about 3057.4042912248. The cubic root of 9347721 is about 210.6534520877.

The spelling of 9347721 in words is "nine million, three hundred forty-seven thousand, seven hundred twenty-one".