9721606 has 4 divisors (see below), whose sum is σ = 14582412. Its totient is φ = 4860802.

The previous prime is 9721589. The next prime is 9721609. The reversal of 9721606 is 6061279.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2430400 + ... + 2430403.

It is an arithmetic number, because the mean of its divisors is an integer number (3645603).

Almost surely, 2^9721606 is an apocalyptic number.

9721606 is a deficient number, since it is larger than the sum of its proper divisors (4860806).

9721606 is a wasteful number, since it uses less digits than its factorization.

9721606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860805.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 9721606 is about 3117.9490053559. The cubic root of 9721606 is about 213.4253514712.

The spelling of 9721606 in words is "nine million, seven hundred twenty-one thousand, six hundred six".