9990440999 has 48 divisors (see below), whose sum is σ = 12855057696. Its totient is φ = 7676928000.

The previous prime is 9990440963. The next prime is 9990441001.

9990440999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9990440999 - 2¹⁶ = 9990375463 is a prime.

It is a super-2 number, since 2×9990440999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990440699) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14251349 + ... + 14252049.

It is an arithmetic number, because the mean of its divisors is an integer number (267813702).

Almost surely, 2^9990440999 is an apocalyptic number.

9990440999 is a deficient number, since it is larger than the sum of its proper divisors (2864616697).

9990440999 is a wasteful number, since it uses less digits than its factorization.

9990440999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 62.

The square root of 9990440999 is about 99952.1935677252. The cubic root of 9990440999 is about 2153.7479964033.

The spelling of 9990440999 in words is "nine billion, nine hundred ninety million, four hundred forty thousand, nine hundred ninety-nine".