989969987 has 8 divisors (see below), whose sum is σ = 1009507536. Its totient is φ = 970464352.

The previous prime is 989969971. The next prime is 989969989. The reversal of 989969987 is 789969989.

989969987 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 cyclic number.

It is not a de Polignac number, because 989969987 - 2⁴ = 989969971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989969989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60368 + ... + 74994.

It is an arithmetic number, because the mean of its divisors is an integer number (126188442).

Almost surely, 2^989969987 is an apocalyptic number.

989969987 is a deficient number, since it is larger than the sum of its proper divisors (19537549).

989969987 is a wasteful number, since it uses less digits than its factorization.

989969987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15957.

The product of its digits is 158723712, while the sum is 74.

The square root of 989969987 is about 31463.7885036116. The cubic root of 989969987 is about 996.6454217211.

The spelling of 989969987 in words is "nine hundred eighty-nine million, nine hundred sixty-nine thousand, nine hundred eighty-seven".