9721982 has 4 divisors (see below), whose sum is σ = 14582976. Its totient is φ = 4860990.

The previous prime is 9721979. The next prime is 9721991. The reversal of 9721982 is 2891279.

9721982 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2430494 + ... + 2430497.

It is an arithmetic number, because the mean of its divisors is an integer number (3645744).

Almost surely, 2^9721982 is an apocalyptic number.

9721982 is a deficient number, since it is larger than the sum of its proper divisors (4860994).

9721982 is a wasteful number, since it uses less digits than its factorization.

9721982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860993.

The product of its digits is 18144, while the sum is 38.

The square root of 9721982 is about 3118.0093008200. The cubic root of 9721982 is about 213.4281029678.

The spelling of 9721982 in words is "nine million, seven hundred twenty-one thousand, nine hundred eighty-two".