9870321 has 4 divisors (see below), whose sum is σ = 13160432. Its totient is φ = 6580212.

The previous prime is 9870317. The next prime is 9870323. The reversal of 9870321 is 1230789.

It is a happy number.

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.

It is not a de Polignac number, because 9870321 - 2² = 9870317 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 (9870323) 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, 1645051 + ... + 1645056.

It is an arithmetic number, because the mean of its divisors is an integer number (3290108).

Almost surely, 2^9870321 is an apocalyptic number.

It is an amenable number.

9870321 is a deficient number, since it is larger than the sum of its proper divisors (3290111).

9870321 is a wasteful number, since it uses less digits than its factorization.

9870321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290110.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 9870321 is about 3141.7067017785. The cubic root of 9870321 is about 214.5081310321.

The spelling of 9870321 in words is "nine million, eight hundred seventy thousand, three hundred twenty-one".