9990281 has 8 divisors (see below), whose sum is σ = 11437440. Its totient is φ = 8548128.

The previous prime is 9990263. The next prime is 9990283. The reversal of 9990281 is 1820999.

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 9990281 - 2¹⁴ = 9973897 is a prime.

It is a super-2 number, since 2×9990281² = 199611428917922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9990283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5405 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (1429680).

Almost surely, 2^9990281 is an apocalyptic number.

It is an amenable number.

9990281 is a deficient number, since it is larger than the sum of its proper divisors (1447159).

9990281 is a wasteful number, since it uses less digits than its factorization.

9990281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 9990281 is about 3160.7405777760. The cubic root of 9990281 is about 215.3736498767.

The spelling of 9990281 in words is "nine million, nine hundred ninety thousand, two hundred eighty-one".