9748721 has 2 divisors, whose sum is σ = 9748722. Its totient is φ = 9748720.

The previous prime is 9748709. The next prime is 9748741. The reversal of 9748721 is 1278479.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8151025 + 1597696 = 2855^2 + 1264^2 .

It is an emirp because it is prime and its reverse (1278479) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9748721 - 2⁶ = 9748657 is a prime.

It is a super-2 number, since 2×9748721² = 190075122271682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9748741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4874360 + 4874361.

It is an arithmetic number, because the mean of its divisors is an integer number (4874361).

Almost surely, 2^9748721 is an apocalyptic number.

It is an amenable number.

9748721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9748721 is an equidigital number, since it uses as much as digits as its factorization.

9748721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 9748721 is about 3122.2941885735. The cubic root of 9748721 is about 213.6235922568.

The spelling of 9748721 in words is "nine million, seven hundred forty-eight thousand, seven hundred twenty-one".