206742859 has 4 divisors (see below), whose sum is σ = 208789920. Its totient is φ = 204695800.

The previous prime is 206742799. The next prime is 206742863. The reversal of 206742859 is 958247602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206742859 - 2¹¹ = 206740811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206742889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1023379 + ... + 1023580.

It is an arithmetic number, because the mean of its divisors is an integer number (52197480).

Almost surely, 2^206742859 is an apocalyptic number.

206742859 is a deficient number, since it is larger than the sum of its proper divisors (2047061).

206742859 is a wasteful number, since it uses less digits than its factorization.

206742859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047060.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 206742859 is about 14378.5555255039. Note that the first 4 decimals coincide. The cubic root of 206742859 is about 591.3031227606.

The spelling of 206742859 in words is "two hundred six million, seven hundred forty-two thousand, eight hundred fifty-nine".