989909990 has 8 divisors (see below), whose sum is σ = 1781838000. Its totient is φ = 395963992.

The previous prime is 989909981. The next prime is 989909993. The reversal of 989909990 is 99909989.

989909990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989909993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49495490 + ... + 49495509.

It is an arithmetic number, because the mean of its divisors is an integer number (222729750).

Almost surely, 2^989909990 is an apocalyptic number.

989909990 is a deficient number, since it is larger than the sum of its proper divisors (791928010).

989909990 is a wasteful number, since it uses less digits than its factorization.

989909990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98991006.

The product of its (nonzero) digits is 4251528, while the sum is 62.

The square root of 989909990 is about 31462.8350597971. The cubic root of 989909990 is about 996.6252874598.

The spelling of 989909990 in words is "nine hundred eighty-nine million, nine hundred nine thousand, nine hundred ninety".