9692721 has 12 divisors (see below), whose sum is σ = 14193348. Its totient is φ = 6372864.

The previous prime is 9692719. The next prime is 9692741. The reversal of 9692721 is 1272969.

9692721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5130225 + 4562496 = 2265^2 + 2136^2 .

It is not a de Polignac number, because 9692721 - 2¹ = 9692719 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

9692721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9692701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6720 + ... + 8033.

It is an arithmetic number, because the mean of its divisors is an integer number (1182779).

Almost surely, 2^9692721 is an apocalyptic number.

It is an amenable number.

9692721 is a deficient number, since it is larger than the sum of its proper divisors (4500627).

9692721 is a wasteful number, since it uses less digits than its factorization.

9692721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14832 (or 14829 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 9692721 is about 3113.3135081453. The cubic root of 9692721 is about 213.2137641052.

The spelling of 9692721 in words is "nine million, six hundred ninety-two thousand, seven hundred twenty-one".