206430289 has 12 divisors (see below), whose sum is σ = 229579356. Its totient is φ = 185395392.

The previous prime is 206430277. The next prime is 206430377. The reversal of 206430289 is 982034602.

It can be written as a sum of positive squares in 6 ways, for example, as 22963264 + 183467025 = 4792^2 + 13545^2 .

It is not a de Polignac number, because 206430289 - 2¹⁷ = 206299217 is a prime.

It is a super-2 number, since 2×206430289² = 85226928433247042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206430089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10254 + ... + 22759.

It is an arithmetic number, because the mean of its divisors is an integer number (19131613).

Almost surely, 2^206430289 is an apocalyptic number.

It is an amenable number.

206430289 is a deficient number, since it is larger than the sum of its proper divisors (23149067).

206430289 is a wasteful number, since it uses less digits than its factorization.

206430289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33076 (or 33063 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 206430289 is about 14367.6821025522. The cubic root of 206430289 is about 591.0049797117.

The spelling of 206430289 in words is "two hundred six million, four hundred thirty thousand, two hundred eighty-nine".