9747921 has 8 divisors (see below), whose sum is σ = 13217760. Its totient is φ = 6388352.

The previous prime is 9747917. The next prime is 9747923. The reversal of 9747921 is 1297479.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9747921 - 2² = 9747917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9747921.

It is not an unprimeable number, because it can be changed into a prime (9747923) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27360 + ... + 27713.

It is an arithmetic number, because the mean of its divisors is an integer number (1652220).

Almost surely, 2^9747921 is an apocalyptic number.

It is an amenable number.

9747921 is a deficient number, since it is larger than the sum of its proper divisors (3469839).

9747921 is a wasteful number, since it uses less digits than its factorization.

9747921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55135.

The product of its digits is 31752, while the sum is 39.

The square root of 9747921 is about 3122.1660750191. The cubic root of 9747921 is about 213.6177486339.

The spelling of 9747921 in words is "nine million, seven hundred forty-seven thousand, nine hundred twenty-one".