206432989 has 12 divisors (see below), whose sum is σ = 250620064. Its totient is φ = 166532544.

The previous prime is 206432983. The next prime is 206433013. The reversal of 206432989 is 989234602.

It is not a de Polignac number, because 206432989 - 2⁵ = 206432957 is a prime.

It is a super-2 number, since 2×206432989² = 85229157894948242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206432983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48999 + ... + 53044.

Almost surely, 2^206432989 is an apocalyptic number.

It is an amenable number.

206432989 is a deficient number, since it is larger than the sum of its proper divisors (44187075).

206432989 is a wasteful number, since it uses less digits than its factorization.

206432989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102084 (or 102067 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 206432989 is about 14367.7760631213. The cubic root of 206432989 is about 591.0075563789.

It can be divided in two parts, 20643 and 2989, that added together give a palindrome (23632).

The spelling of 206432989 in words is "two hundred six million, four hundred thirty-two thousand, nine hundred eighty-nine".