206874289 has 4 divisors (see below), whose sum is σ = 212465524. Its totient is φ = 201283056.

The previous prime is 206874281. The next prime is 206874293. The reversal of 206874289 is 982478602.

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 185640625 + 21233664 = 13625^2 + 4608^2 .

It is a cyclic number.

It is not a de Polignac number, because 206874289 - 2³ = 206874281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206874281) 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, 2795562 + ... + 2795635.

It is an arithmetic number, because the mean of its divisors is an integer number (53116381).

Almost surely, 2^206874289 is an apocalyptic number.

It is an amenable number.

206874289 is a deficient number, since it is larger than the sum of its proper divisors (5591235).

206874289 is an equidigital number, since it uses as much as digits as its factorization.

206874289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591234.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 206874289 is about 14383.1251471994. The cubic root of 206874289 is about 591.4283967481.

It can be divided in two parts, 20687 and 4289, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 206874289 in words is "two hundred six million, eight hundred seventy-four thousand, two hundred eighty-nine".