9404721 has 8 divisors (see below), whose sum is σ = 13932960. Its totient is φ = 6269796.

The previous prime is 9404699. The next prime is 9404737. The reversal of 9404721 is 1274049.

It is a happy number.

It is not a de Polignac number, because 9404721 - 2¹⁵ = 9371953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 348323 = 9404721 / (9 + 4 + 0 + 4 + 7 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9404761) 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, 174135 + ... + 174188.

It is an arithmetic number, because the mean of its divisors is an integer number (1741620).

Almost surely, 2^9404721 is an apocalyptic number.

It is an amenable number.

9404721 is a deficient number, since it is larger than the sum of its proper divisors (4528239).

9404721 is a wasteful number, since it uses less digits than its factorization.

9404721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348332 (or 348326 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 9404721 is about 3066.7117569149. The cubic root of 9404721 is about 211.0807549355.

The spelling of 9404721 in words is "nine million, four hundred four thousand, seven hundred twenty-one".