206438769 has 36 divisors (see below), whose sum is σ = 319599280. Its totient is φ = 128373120.

The previous prime is 206438747. The next prime is 206438797. The reversal of 206438769 is 967834602.

206438769 is a `hidden beast` number, since 206 + 4 + 387 + 69 = 666.

It is not a de Polignac number, because 206438769 - 2¹³ = 206430577 is a prime.

It is a super-2 number, since 2×206438769² = 85233930692470722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206438719) 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 35 ways as a sum of consecutive naturals, for example, 361254 + ... + 361824.

Almost surely, 2^206438769 is an apocalyptic number.

It is an amenable number.

206438769 is a deficient number, since it is larger than the sum of its proper divisors (113160511).

206438769 is a wasteful number, since it uses less digits than its factorization.

206438769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 206438769 is about 14367.9772062737. The cubic root of 206438769 is about 591.0130722799.

The spelling of 206438769 in words is "two hundred six million, four hundred thirty-eight thousand, seven hundred sixty-nine".