206885643 has 8 divisors (see below), whose sum is σ = 275988288. Its totient is φ = 137853384.

The previous prime is 206885639. The next prime is 206885669. The reversal of 206885643 is 346588602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206885643 - 2² = 206885639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206885595 and 206885604.

It is not an unprimeable number, because it can be changed into a prime (206885633) 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 7 ways as a sum of consecutive naturals, for example, 10305 + ... + 22802.

It is an arithmetic number, because the mean of its divisors is an integer number (34498536).

Almost surely, 2^206885643 is an apocalyptic number.

206885643 is a deficient number, since it is larger than the sum of its proper divisors (69102645).

206885643 is a wasteful number, since it uses less digits than its factorization.

206885643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35193.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 206885643 is about 14383.5198404285. The cubic root of 206885643 is about 591.4392164512.

The spelling of 206885643 in words is "two hundred six million, eight hundred eighty-five thousand, six hundred forty-three".