9921489 has 16 divisors (see below), whose sum is σ = 14084928. Its totient is φ = 6190592.

The previous prime is 9921479. The next prime is 9921491. The reversal of 9921489 is 9841299.

It is a cyclic number.

It is not a de Polignac number, because 9921489 - 2⁴ = 9921473 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 9921489.

It is not an unprimeable number, because it can be changed into a prime (9921409) 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 15 ways as a sum of consecutive naturals, for example, 11149 + ... + 12005.

It is an arithmetic number, because the mean of its divisors is an integer number (880308).

Almost surely, 2^9921489 is an apocalyptic number.

It is an amenable number.

9921489 is a deficient number, since it is larger than the sum of its proper divisors (4163439).

9921489 is a wasteful number, since it uses less digits than its factorization.

9921489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104.

The product of its digits is 46656, while the sum is 42.

The square root of 9921489 is about 3149.8395197216. The cubic root of 9921489 is about 214.8781642507.

The spelling of 9921489 in words is "nine million, nine hundred twenty-one thousand, four hundred eighty-nine".