9713721 has 8 divisors (see below), whose sum is σ = 13301824. Its totient is φ = 6300720.

The previous prime is 9713713. The next prime is 9713729. The reversal of 9713721 is 1273179.

It is an interprime number because it is at equal distance from previous prime (9713713) and next prime (9713729).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9713721 - 2³ = 9713713 is a prime.

It is a Duffinian number.

9713721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9713729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43645 + ... + 43866.

It is an arithmetic number, because the mean of its divisors is an integer number (1662728).

Almost surely, 2^9713721 is an apocalyptic number.

It is an amenable number.

9713721 is a deficient number, since it is larger than the sum of its proper divisors (3588103).

9713721 is a wasteful number, since it uses less digits than its factorization.

9713721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87551.

The product of its digits is 2646, while the sum is 30.

The square root of 9713721 is about 3116.6842958503. The cubic root of 9713721 is about 213.3676341873.

The spelling of 9713721 in words is "nine million, seven hundred thirteen thousand, seven hundred twenty-one".