9809990 has 8 divisors (see below), whose sum is σ = 17658000. Its totient is φ = 3923992.

The previous prime is 9809971. The next prime is 9810001. The reversal of 9809990 is 999089.

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

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490490 + ... + 490509.

It is an arithmetic number, because the mean of its divisors is an integer number (2207250).

Almost surely, 2^9809990 is an apocalyptic number.

9809990 is a deficient number, since it is larger than the sum of its proper divisors (7848010).

9809990 is a wasteful number, since it uses less digits than its factorization.

9809990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981006.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 9809990 is about 3132.0903562956. The cubic root of 9809990 is about 214.0701868943.

It can be divided in two parts, 98099 and 90, that added together give a palindrome (98189).

The spelling of 9809990 in words is "nine million, eight hundred nine thousand, nine hundred ninety".