208306969 has 4 divisors (see below), whose sum is σ = 224330596. Its totient is φ = 192283344.

The previous prime is 208306939. The next prime is 208306979. The reversal of 208306969 is 969603802.

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 75481344 + 132825625 = 8688^2 + 11525^2 .

It is a cyclic number.

It is not a de Polignac number, because 208306969 - 2¹⁹ = 207782681 is a prime.

It is a super-2 number, since 2×208306969² = 86783586667933922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208306909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8011794 + ... + 8011819.

It is an arithmetic number, because the mean of its divisors is an integer number (56082649).

Almost surely, 2^208306969 is an apocalyptic number.

It is an amenable number.

208306969 is a deficient number, since it is larger than the sum of its proper divisors (16023627).

208306969 is a wasteful number, since it uses less digits than its factorization.

208306969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16023626.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 208306969 is about 14432.8434135481. The cubic root of 208306969 is about 592.7905429946.

The spelling of 208306969 in words is "two hundred eight million, three hundred six thousand, nine hundred sixty-nine".