989585989 has 4 divisors (see below), whose sum is σ = 1130955424. Its totient is φ = 848216556.

The previous prime is 989585983. The next prime is 989586011.

It is a happy number.

989585989 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 989585989 - 2⁵ = 989585957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989585983) 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, 70684707 + ... + 70684720.

It is an arithmetic number, because the mean of its divisors is an integer number (282738856).

Almost surely, 2^989585989 is an apocalyptic number.

It is an amenable number.

989585989 is a deficient number, since it is larger than the sum of its proper divisors (141369435).

989585989 is a wasteful number, since it uses less digits than its factorization.

989585989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141369434.

The product of its digits is 83980800, while the sum is 70.

The square root of 989585989 is about 31457.6856904636. The cubic root of 989585989 is about 996.5165426146.

The spelling of 989585989 in words is "nine hundred eighty-nine million, five hundred eighty-five thousand, nine hundred eighty-nine".