990881916 has 24 divisors (see below), whose sum is σ = 2312570064. Its totient is φ = 330220800.

The previous prime is 990881909. The next prime is 990881917. The reversal of 990881916 is 619188099.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990881917) by changing a digit.

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, 92116 + ... + 102308.

It is an arithmetic number, because the mean of its divisors is an integer number (96357086).

Almost surely, 2^990881916 is an apocalyptic number.

It is an amenable number.

990881916 is an abundant number, since it is smaller than the sum of its proper divisors (1321688148).

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

990881916 is a wasteful number, since it uses less digits than its factorization.

990881916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18301 (or 18299 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 990881916 is about 31478.2768905796. The cubic root of 990881916 is about 996.9513538684.

The spelling of 990881916 in words is "nine hundred ninety million, eight hundred eighty-one thousand, nine hundred sixteen".