999189880944 has 40 divisors (see below), whose sum is σ = 2581824669312. Its totient is φ = 332987920320.

The previous prime is 999189880873. The next prime is 999189880981. The reversal of 999189880944 is 449088981999.

It is a super-2 number, since 2×999189880944² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999189880944.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140902 + ... + 2565509.

Almost surely, 2^999189880944 is an apocalyptic number.

It is an amenable number.

999189880944 is an abundant number, since it is smaller than the sum of its proper divisors (1582634788368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999189880944 is a wasteful number, since it uses less digits than its factorization.

999189880944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710845 (or 4710839 counting only the distinct ones).

The product of its (nonzero) digits is 483729408, while the sum is 78.

The spelling of 999189880944 in words is "nine hundred ninety-nine billion, one hundred eighty-nine million, eight hundred eighty thousand, nine hundred forty-four".