9921285 has 80 divisors (see below), whose sum is σ = 20699712.
Its totient is φ = 4492800.
The previous prime is 9921283. The next prime is 9921299. The reversal of 9921285 is 5821299.
9921285 is a nontrivial binomial coefficient, being equal to C(4455, 2).
It is not a de Polignac number, because 9921285 - 21 = 9921283 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9921283) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 75670 + ... + 75800.
Almost surely, 29921285 is an apocalyptic number.
9921285 is the 4454-th triangular number.
It is an amenable number.
9921285 is an abundant number, since it is smaller than the sum of its proper divisors (10778427).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9921285 is a wasteful number, since it uses less digits than its factorization.
9921285 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 176 (or 167 counting only the distinct ones).
The product of its digits is 12960, while the sum is 36.
The square root of 9921285 is about 3149.8071369530.
The cubic root of 9921285 is about 214.8766915065.
The spelling of 9921285 in words is "nine million, nine hundred twenty-one thousand, two hundred eighty-five".