9858921 has 4 divisors (see below), whose sum is σ = 13145232. Its totient is φ = 6572612.

The previous prime is 9858887. The next prime is 9858949. The reversal of 9858921 is 1298589.

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 a cyclic number.

It is not a de Polignac number, because 9858921 - 2¹⁸ = 9596777 is a prime.

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

9858921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9858971) 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, 1643151 + ... + 1643156.

It is an arithmetic number, because the mean of its divisors is an integer number (3286308).

Almost surely, 2^9858921 is an apocalyptic number.

It is an amenable number.

9858921 is a deficient number, since it is larger than the sum of its proper divisors (3286311).

9858921 is a wasteful number, since it uses less digits than its factorization.

9858921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286310.

The product of its digits is 51840, while the sum is 42.

The square root of 9858921 is about 3139.8918771193. The cubic root of 9858921 is about 214.4255151862.

The spelling of 9858921 in words is "nine million, eight hundred fifty-eight thousand, nine hundred twenty-one".