989999479 has 6 divisors (see below), whose sum is σ = 1151632104. Its totient is φ = 848570940.

The previous prime is 989999473. The next prime is 989999497. The reversal of 989999479 is 974999989.

989999479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 989999479 - 2⁵ = 989999447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989999473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10101987 + ... + 10102084.

It is an arithmetic number, because the mean of its divisors is an integer number (191938684).

Almost surely, 2^989999479 is an apocalyptic number.

989999479 is a deficient number, since it is larger than the sum of its proper divisors (161632625).

989999479 is a wasteful number, since it uses less digits than its factorization.

989999479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20204085 (or 20204078 counting only the distinct ones).

The product of its digits is 119042784, while the sum is 73.

The square root of 989999479 is about 31464.2571658700. The cubic root of 989999479 is about 996.6553185784.

The spelling of 989999479 in words is "nine hundred eighty-nine million, nine hundred ninety-nine thousand, four hundred seventy-nine".