989434434989 has 64 divisors (see below), whose sum is σ = 1343136657408. Its totient is φ = 703843084800.

The previous prime is 989434434973. The next prime is 989434435051.

989434434989 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 989434434989 - 2⁴ = 989434434973 is a prime.

It is a super-2 number, since 2×989434434989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989434431989) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83610617 + ... + 83622449.

It is an arithmetic number, because the mean of its divisors is an integer number (20986510272).

Almost surely, 2^989434434989 is an apocalyptic number.

It is an amenable number.

989434434989 is a deficient number, since it is larger than the sum of its proper divisors (353702222419).

989434434989 is a wasteful number, since it uses less digits than its factorization.

989434434989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12778.

The product of its digits is 967458816, while the sum is 74.

The spelling of 989434434989 in words is "nine hundred eighty-nine billion, four hundred thirty-four million, four hundred thirty-four thousand, nine hundred eighty-nine".