209685972 has 48 divisors (see below), whose sum is σ = 502754112. Its totient is φ = 67979520.

The previous prime is 209685943. The next prime is 209685977. The reversal of 209685972 is 279586902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209685977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276618 + ... + 277374.

It is an arithmetic number, because the mean of its divisors is an integer number (10474044).

Almost surely, 2^209685972 is an apocalyptic number.

It is an amenable number.

209685972 is an abundant number, since it is smaller than the sum of its proper divisors (293068140).

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

209685972 is a wasteful number, since it uses less digits than its factorization.

209685972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 209685972 is about 14480.5376971990. The cubic root of 209685972 is about 594.0957684357.

The spelling of 209685972 in words is "two hundred nine million, six hundred eighty-five thousand, nine hundred seventy-two".