989656989 has 16 divisors (see below), whose sum is σ = 1442234880. Its totient is φ = 600929280.

The previous prime is 989656963. The next prime is 989656999.

989656989 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 989656989 - 2¹² = 989652893 is a prime.

It is a super-2 number, since 2×989656989² = 1958841911753092242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989656919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311404 + ... + 314565.

It is an arithmetic number, because the mean of its divisors is an integer number (90139680).

Almost surely, 2^989656989 is an apocalyptic number.

It is an amenable number.

989656989 is a deficient number, since it is larger than the sum of its proper divisors (452577891).

989656989 is a wasteful number, since it uses less digits than its factorization.

989656989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626020.

The product of its digits is 75582720, while the sum is 69.

The square root of 989656989 is about 31458.8141702767. The cubic root of 989656989 is about 996.5403744606.

The spelling of 989656989 in words is "nine hundred eighty-nine million, six hundred fifty-six thousand, nine hundred eighty-nine".