9890321 has 4 divisors (see below), whose sum is σ = 11303232. Its totient is φ = 8477412.

The previous prime is 9890297. The next prime is 9890329. The reversal of 9890321 is 1230989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1230989 = 331 ⋅3719.

It is a cyclic number.

It is not a de Polignac number, because 9890321 - 2¹⁴ = 9873937 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 (9890329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706445 + ... + 706458.

It is an arithmetic number, because the mean of its divisors is an integer number (2825808).

Almost surely, 2^9890321 is an apocalyptic number.

It is an amenable number.

9890321 is a deficient number, since it is larger than the sum of its proper divisors (1412911).

9890321 is a wasteful number, since it uses less digits than its factorization.

9890321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412910.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 9890321 is about 3144.8880743200. Note that the first 3 decimals coincide. The cubic root of 9890321 is about 214.6529175489.

The spelling of 9890321 in words is "nine million, eight hundred ninety thousand, three hundred twenty-one".