9909720 has 48 divisors (see below), whose sum is σ = 32207760. Its totient is φ = 2642496.

The previous prime is 9909719. The next prime is 9909749. The reversal of 9909720 is 279099.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13404 + ... + 14123.

It is an arithmetic number, because the mean of its divisors is an integer number (670995).

Almost surely, 2^9909720 is an apocalyptic number.

9909720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9909720 is an abundant number, since it is smaller than the sum of its proper divisors (22298040).

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

9909720 is a wasteful number, since it uses less digits than its factorization.

9909720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27544 (or 27537 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 9909720 is about 3147.9707749596. The cubic root of 9909720 is about 214.7931668706.

The spelling of 9909720 in words is "nine million, nine hundred nine thousand, seven hundred twenty".