206985769 has 3 divisors (see below), whose sum is σ = 207000157. Its totient is φ = 206971382.

The previous prime is 206985719. The next prime is 206985781. The reversal of 206985769 is 967589602.

It is a happy number.

The square root of 206985769 is 14387.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 206985769 - 2⁷ = 206985641 is a prime.

It is a super-2 number, since 2×206985769² = 85686217137042722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206985719) 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 2 ways as a sum of consecutive naturals, for example, 7194 + ... + 21580.

Almost surely, 2^206985769 is an apocalyptic number.

206985769 is the 14387-th square number.

206985769 is the 7194-th centered octagonal number.

It is an amenable number.

206985769 is a deficient number, since it is larger than the sum of its proper divisors (14388).

206985769 is an frugal number, since it uses more digits than its factorization.

206985769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28774 (or 14387 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The cubic root of 206985769 is about 591.5346135853.

The spelling of 206985769 in words is "two hundred six million, nine hundred eighty-five thousand, seven hundred sixty-nine".