989691128 has 16 divisors (see below), whose sum is σ = 1900931760. Its totient is φ = 482776000.

The previous prime is 989691121. The next prime is 989691137. The reversal of 989691128 is 821196989.

It is a self number, because there is not a number n which added to its sum of digits gives 989691128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989691121) 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, 1508348 + ... + 1509003.

It is an arithmetic number, because the mean of its divisors is an integer number (118808235).

Almost surely, 2^989691128 is an apocalyptic number.

It is an amenable number.

989691128 is a deficient number, since it is larger than the sum of its proper divisors (911240632).

989691128 is a wasteful number, since it uses less digits than its factorization.

989691128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017398 (or 3017394 counting only the distinct ones).

The product of its digits is 559872, while the sum is 53.

The square root of 989691128 is about 31459.3567639264. The cubic root of 989691128 is about 996.5518331447.

The spelling of 989691128 in words is "nine hundred eighty-nine million, six hundred ninety-one thousand, one hundred twenty-eight".