9721198 has 16 divisors (see below), whose sum is σ = 15678720. Its totient is φ = 4505976.

The previous prime is 9721189. The next prime is 9721199. The reversal of 9721198 is 8911279.

9721198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936 + ... + 4507.

It is an arithmetic number, because the mean of its divisors is an integer number (979920).

Almost surely, 2^9721198 is an apocalyptic number.

9721198 is a deficient number, since it is larger than the sum of its proper divisors (5957522).

9721198 is a wasteful number, since it uses less digits than its factorization.

9721198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5511.

The product of its digits is 9072, while the sum is 37.

The square root of 9721198 is about 3117.8835770439. The cubic root of 9721198 is about 213.4223657244.

The spelling of 9721198 in words is "nine million, seven hundred twenty-one thousand, one hundred ninety-eight".