9738721 has 2 divisors, whose sum is σ = 9738722. Its totient is φ = 9738720.

The previous prime is 9738719. The next prime is 9738737. The reversal of 9738721 is 1278379.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 1392400 = 2889^2 + 1180^2 .

It is an emirp because it is prime and its reverse (1278379) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9738721 - 2¹ = 9738719 is a prime.

Together with 9738719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9738791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4869360 + 4869361.

It is an arithmetic number, because the mean of its divisors is an integer number (4869361).

Almost surely, 2^9738721 is an apocalyptic number.

It is an amenable number.

9738721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9738721 is an equidigital number, since it uses as much as digits as its factorization.

9738721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 9738721 is about 3120.6923911209. The cubic root of 9738721 is about 213.5505239787.

The spelling of 9738721 in words is "nine million, seven hundred thirty-eight thousand, seven hundred twenty-one".