989662947 has 24 divisors (see below), whose sum is σ = 1653066576. Its totient is φ = 522019008.

The previous prime is 989662913. The next prime is 989662969. The reversal of 989662947 is 749266989.

It is not a de Polignac number, because 989662947 - 2⁷ = 989662819 is a prime.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (989662987) 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 23 ways as a sum of consecutive naturals, for example, 257028 + ... + 260849.

It is an arithmetic number, because the mean of its divisors is an integer number (68877774).

Almost surely, 2^989662947 is an apocalyptic number.

989662947 is a deficient number, since it is larger than the sum of its proper divisors (663403629).

989662947 is a wasteful number, since it uses less digits than its factorization.

989662947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517907 (or 517900 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 60.

The square root of 989662947 is about 31458.9088653755. The cubic root of 989662947 is about 996.5423742698.

The spelling of 989662947 in words is "nine hundred eighty-nine million, six hundred sixty-two thousand, nine hundred forty-seven".