206645843 has 4 divisors (see below), whose sum is σ = 217521960. Its totient is φ = 195769728.

The previous prime is 206645833. The next prime is 206645861. The reversal of 206645843 is 348546602.

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 206645843 - 2⁴ = 206645827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206645797 and 206645806.

It is not an unprimeable number, because it can be changed into a prime (206645833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5438030 + ... + 5438067.

It is an arithmetic number, because the mean of its divisors is an integer number (54380490).

Almost surely, 2^206645843 is an apocalyptic number.

206645843 is a deficient number, since it is larger than the sum of its proper divisors (10876117).

206645843 is a wasteful number, since it uses less digits than its factorization.

206645843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10876116.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 206645843 is about 14375.1814945064. The cubic root of 206645843 is about 591.2106168017.

The spelling of 206645843 in words is "two hundred six million, six hundred forty-five thousand, eight hundred forty-three".