9478721 has 8 divisors (see below), whose sum is σ = 10852800. Its totient is φ = 8109648.

The previous prime is 9478717. The next prime is 9478727. The reversal of 9478721 is 1278749.

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 9478721 - 2² = 9478717 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (9478727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4730 + ... + 6428.

It is an arithmetic number, because the mean of its divisors is an integer number (1356600).

Almost surely, 2^9478721 is an apocalyptic number.

It is an amenable number.

9478721 is a deficient number, since it is larger than the sum of its proper divisors (1374079).

9478721 is a wasteful number, since it uses less digits than its factorization.

9478721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503.

The product of its digits is 28224, while the sum is 38.

The square root of 9478721 is about 3078.7531567178. The cubic root of 9478721 is about 211.6329310182.

The spelling of 9478721 in words is "nine million, four hundred seventy-eight thousand, seven hundred twenty-one".