9799921 has 4 divisors (see below), whose sum is σ = 9831744. Its totient is φ = 9768100.

The previous prime is 9799913. The next prime is 9799927. The reversal of 9799921 is 1299979.

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 9799921 - 2³ = 9799913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9799927) 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, 15445 + ... + 16066.

It is an arithmetic number, because the mean of its divisors is an integer number (2457936).

Almost surely, 2^9799921 is an apocalyptic number.

It is an amenable number.

9799921 is a deficient number, since it is larger than the sum of its proper divisors (31823).

9799921 is a wasteful number, since it uses less digits than its factorization.

9799921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31822.

The product of its digits is 91854, while the sum is 46.

The square root of 9799921 is about 3130.4825506621. The cubic root of 9799921 is about 213.9969210842.

The spelling of 9799921 in words is "nine million, seven hundred ninety-nine thousand, nine hundred twenty-one".