9739721 has 2 divisors, whose sum is σ = 9739722. Its totient is φ = 9739720.

The previous prime is 9739711. The next prime is 9739747. The reversal of 9739721 is 1279379.

9739721 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8761600 + 978121 = 2960^2 + 989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9739721 is a prime.

It is not a weakly prime, because it can be changed into another prime (9739711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4869860 + 4869861.

It is an arithmetic number, because the mean of its divisors is an integer number (4869861).

Almost surely, 2^9739721 is an apocalyptic number.

It is an amenable number.

9739721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9739721 is an equidigital number, since it uses as much as digits as its factorization.

9739721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 38.

The square root of 9739721 is about 3120.8526078622. The cubic root of 9739721 is about 213.5578330567.

The spelling of 9739721 in words is "nine million, seven hundred thirty-nine thousand, seven hundred twenty-one".