209985016 has 8 divisors (see below), whose sum is σ = 393721920. Its totient is φ = 104992504.

The previous prime is 209984981. The next prime is 209985019. The reversal of 209985016 is 610589902.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 209985016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209985019) 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 as a sum of consecutive naturals, namely, 13124056 + ... + 13124071.

It is an arithmetic number, because the mean of its divisors is an integer number (49215240).

Almost surely, 2^209985016 is an apocalyptic number.

It is an amenable number.

209985016 is a deficient number, since it is larger than the sum of its proper divisors (183736904).

209985016 is a wasteful number, since it uses less digits than its factorization.

209985016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26248133 (or 26248129 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 209985016 is about 14490.8597398498. The cubic root of 209985016 is about 594.3780578406.

The spelling of 209985016 in words is "two hundred nine million, nine hundred eighty-five thousand, sixteen".