206689867 has 4 divisors (see below), whose sum is σ = 208621656. Its totient is φ = 204758080.

The previous prime is 206689853. The next prime is 206689919. The reversal of 206689867 is 768986602.

206689867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 206689867 - 2⁷ = 206689739 is a prime.

It is a super-2 number, since 2×206689867² = 85441402240955378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206689267) 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, 965734 + ... + 965947.

It is an arithmetic number, because the mean of its divisors is an integer number (52155414).

Almost surely, 2^206689867 is an apocalyptic number.

206689867 is a deficient number, since it is larger than the sum of its proper divisors (1931789).

206689867 is a wasteful number, since it uses less digits than its factorization.

206689867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931788.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 206689867 is about 14376.7126631925. The cubic root of 206689867 is about 591.2525978190.

The spelling of 206689867 in words is "two hundred six million, six hundred eighty-nine thousand, eight hundred sixty-seven".