9921790 has 8 divisors (see below), whose sum is σ = 17859240. Its totient is φ = 3968712.

The previous prime is 9921733. The next prime is 9921797. The reversal of 9921790 is 971299.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921797) 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, 496080 + ... + 496099.

It is an arithmetic number, because the mean of its divisors is an integer number (2232405).

Almost surely, 2^9921790 is an apocalyptic number.

9921790 is a deficient number, since it is larger than the sum of its proper divisors (7937450).

9921790 is a wasteful number, since it uses less digits than its factorization.

9921790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992186.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 9921790 is about 3149.8872995712. The cubic root of 9921790 is about 214.8803372334.

The spelling of 9921790 in words is "nine million, nine hundred twenty-one thousand, seven hundred ninety".