989555990 has 16 divisors (see below), whose sum is σ = 1822624848. Its totient is φ = 386617056.

The previous prime is 989555989. The next prime is 989555993. The reversal of 989555990 is 99555989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989555993) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1150217 + ... + 1151076.

It is an arithmetic number, because the mean of its divisors is an integer number (113914053).

Almost surely, 2^989555990 is an apocalyptic number.

989555990 is a deficient number, since it is larger than the sum of its proper divisors (833068858).

989555990 is a wasteful number, since it uses less digits than its factorization.

989555990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301343.

The product of its (nonzero) digits is 6561000, while the sum is 59.

The square root of 989555990 is about 31457.2088717356. The cubic root of 989555990 is about 996.5064728137.

The spelling of 989555990 in words is "nine hundred eighty-nine million, five hundred fifty-five thousand, nine hundred ninety".