9721724 has 12 divisors (see below), whose sum is σ = 17562048. Its totient is φ = 4704000.

The previous prime is 9721721. The next prime is 9721727. The reversal of 9721724 is 4271279.

It is an interprime number because it is at equal distance from previous prime (9721721) and next prime (9721727).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39077 + ... + 39324.

It is an arithmetic number, because the mean of its divisors is an integer number (1463504).

Almost surely, 2^9721724 is an apocalyptic number.

It is an amenable number.

9721724 is a deficient number, since it is larger than the sum of its proper divisors (7840324).

9721724 is a wasteful number, since it uses less digits than its factorization.

9721724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78436 (or 78434 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 9721724 is about 3117.9679279941. The cubic root of 9721724 is about 213.4262149804.

The spelling of 9721724 in words is "nine million, seven hundred twenty-one thousand, seven hundred twenty-four".