206740989 has 24 divisors (see below), whose sum is σ = 367540992. Its totient is φ = 109049760.

The previous prime is 206740987. The next prime is 206740991. The reversal of 206740989 is 989047602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (206740987) and next prime (206740991).

It is not a de Polignac number, because 206740989 - 2¹ = 206740987 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206740987) 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 23 ways as a sum of consecutive naturals, for example, 125397 + ... + 127034.

It is an arithmetic number, because the mean of its divisors is an integer number (15314208).

Almost surely, 2^206740989 is an apocalyptic number.

It is an amenable number.

206740989 is a deficient number, since it is larger than the sum of its proper divisors (160800003).

206740989 is a wasteful number, since it uses less digits than its factorization.

206740989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252457 (or 252454 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 206740989 is about 14378.4904979626. The cubic root of 206740989 is about 591.3013399660.

The spelling of 206740989 in words is "two hundred six million, seven hundred forty thousand, nine hundred eighty-nine".