206442889 has 4 divisors (see below), whose sum is σ = 208486980. Its totient is φ = 204398800.

The previous prime is 206442877. The next prime is 206442931. The reversal of 206442889 is 988244602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 195440400 + 11002489 = 13980^2 + 3317^2 .

It is a cyclic number.

It is not a de Polignac number, because 206442889 - 2²⁷ = 72225161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206442289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021894 + ... + 1022095.

It is an arithmetic number, because the mean of its divisors is an integer number (52121745).

Almost surely, 2^206442889 is an apocalyptic number.

It is an amenable number.

206442889 is a deficient number, since it is larger than the sum of its proper divisors (2044091).

206442889 is a wasteful number, since it uses less digits than its factorization.

206442889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044090.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 206442889 is about 14368.1205799506. The cubic root of 206442889 is about 591.0170039666.

The spelling of 206442889 in words is "two hundred six million, four hundred forty-two thousand, eight hundred eighty-nine".