9427721 has 8 divisors (see below), whose sum is σ = 9647904. Its totient is φ = 9210240.

The previous prime is 9427687. The next prime is 9427727. The reversal of 9427721 is 1277249.

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

It is a cyclic number.

It is not a de Polignac number, because 9427721 - 2¹⁸ = 9165577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9427727) 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 7 ways as a sum of consecutive naturals, for example, 7466 + ... + 8636.

It is an arithmetic number, because the mean of its divisors is an integer number (1205988).

Almost surely, 2^9427721 is an apocalyptic number.

It is an amenable number.

9427721 is a deficient number, since it is larger than the sum of its proper divisors (220183).

9427721 is a wasteful number, since it uses less digits than its factorization.

9427721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351.

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

The square root of 9427721 is about 3070.4594118796. The cubic root of 9427721 is about 211.2526864964.

The spelling of 9427721 in words is "nine million, four hundred twenty-seven thousand, seven hundred twenty-one".