9721420 has 12 divisors (see below), whose sum is σ = 20415024. Its totient is φ = 3888560.

The previous prime is 9721373. The next prime is 9721421. The reversal of 9721420 is 241279.

It is not an unprimeable number, because it can be changed into a prime (9721421) 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, 243016 + ... + 243055.

It is an arithmetic number, because the mean of its divisors is an integer number (1701252).

Almost surely, 2^9721420 is an apocalyptic number.

It is an amenable number.

9721420 is an abundant number, since it is smaller than the sum of its proper divisors (10693604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9721420 is a wasteful number, since it uses less digits than its factorization.

9721420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486080 (or 486078 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 9721420 is about 3117.9191779134. The cubic root of 9721420 is about 213.4239903323.

Adding to 9721420 its reverse (241279), we get a palindrome (9962699).

The spelling of 9721420 in words is "nine million, seven hundred twenty-one thousand, four hundred twenty".