206926889 has 4 divisors (see below), whose sum is σ = 222844356. Its totient is φ = 191009424.

The previous prime is 206926859. The next prime is 206926901. The reversal of 206926889 is 988629602.

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 104755225 + 102171664 = 10235^2 + 10108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206926889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206926849) 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, 7958714 + ... + 7958739.

It is an arithmetic number, because the mean of its divisors is an integer number (55711089).

Almost surely, 2^206926889 is an apocalyptic number.

It is an amenable number.

206926889 is a deficient number, since it is larger than the sum of its proper divisors (15917467).

206926889 is a wasteful number, since it uses less digits than its factorization.

206926889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15917466.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 206926889 is about 14384.9535626640. The cubic root of 206926889 is about 591.4785181650.

The spelling of 206926889 in words is "two hundred six million, nine hundred twenty-six thousand, eight hundred eighty-nine".