209486868 has 24 divisors (see below), whose sum is σ = 490711872. Its totient is φ = 69556224.

The previous prime is 209486863. The next prime is 209486873. The reversal of 209486868 is 868684902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (209486863) and next prime (209486873).

It is a self number, because there is not a number n which added to its sum of digits gives 209486868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209486861) 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 7 ways as a sum of consecutive naturals, for example, 30880 + ... + 37047.

It is an arithmetic number, because the mean of its divisors is an integer number (20446328).

Almost surely, 2^209486868 is an apocalyptic number.

It is an amenable number.

209486868 is an abundant number, since it is smaller than the sum of its proper divisors (281225004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209486868 is a wasteful number, since it uses less digits than its factorization.

209486868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68191 (or 68189 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The square root of 209486868 is about 14473.6611816085. The cubic root of 209486868 is about 593.9076708063.

The spelling of 209486868 in words is "two hundred nine million, four hundred eighty-six thousand, eight hundred sixty-eight".