9490721 has 4 divisors (see below), whose sum is σ = 9722244. Its totient is φ = 9259200.

The previous prime is 9490717. The next prime is 9490813. The reversal of 9490721 is 1270949.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1270949 = 137 ⋅9277.

It can be written as a sum of positive squares in 2 ways, for example, as 3013696 + 6477025 = 1736^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 9490721 - 2² = 9490717 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9490711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115700 + ... + 115781.

It is an arithmetic number, because the mean of its divisors is an integer number (2430561).

Almost surely, 2^9490721 is an apocalyptic number.

It is an amenable number.

9490721 is a deficient number, since it is larger than the sum of its proper divisors (231523).

9490721 is a wasteful number, since it uses less digits than its factorization.

9490721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231522.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 9490721 is about 3080.7013811793. The cubic root of 9490721 is about 211.7222020011.

The spelling of 9490721 in words is "nine million, four hundred ninety thousand, seven hundred twenty-one".