9990437445 has 12 divisors (see below), whose sum is σ = 17316758316. Its totient is φ = 5328233280.

The previous prime is 9990437381. The next prime is 9990437467. The reversal of 9990437445 is 5447340999.

It can be written as a sum of positive squares in 2 ways, for example, as 7409594241 + 2580843204 = 86079^2 + 50802^2 .

It is not a de Polignac number, because 9990437445 - 2⁶ = 9990437381 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9990437391 and 9990437400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111004816 + ... + 111004905.

It is an arithmetic number, because the mean of its divisors is an integer number (1443063193).

Almost surely, 2^9990437445 is an apocalyptic number.

It is an amenable number.

9990437445 is a deficient number, since it is larger than the sum of its proper divisors (7326320871).

9990437445 is a wasteful number, since it uses less digits than its factorization.

9990437445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222009732 (or 222009729 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The square root of 9990437445 is about 99952.1757892243. The cubic root of 9990437445 is about 2153.7477410118.

The spelling of 9990437445 in words is "nine billion, nine hundred ninety million, four hundred thirty-seven thousand, four hundred forty-five".