989894687 has 2 divisors, whose sum is σ = 989894688. Its totient is φ = 989894686.

The previous prime is 989894639. The next prime is 989894747. The reversal of 989894687 is 786498989.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989894687 - 2¹⁶ = 989829151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989894617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494947343 + 494947344.

It is an arithmetic number, because the mean of its divisors is an integer number (494947344).

Almost surely, 2^989894687 is an apocalyptic number.

989894687 is a deficient number, since it is larger than the sum of its proper divisors (1).

989894687 is an equidigital number, since it uses as much as digits as its factorization.

989894687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 68.

The square root of 989894687 is about 31462.5918671682. The cubic root of 989894687 is about 996.6201518294.

The spelling of 989894687 in words is "nine hundred eighty-nine million, eight hundred ninety-four thousand, six hundred eighty-seven".