209680148 has 6 divisors (see below), whose sum is σ = 366940266. Its totient is φ = 104840072.

The previous prime is 209680117. The next prime is 209680157. The reversal of 209680148 is 841086902.

It can be written as a sum of positive squares in only one way, i.e., 165431044 + 44249104 = 12862^2 + 6652^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 26210015 + ... + 26210022.

It is an arithmetic number, because the mean of its divisors is an integer number (61156711).

Almost surely, 2^209680148 is an apocalyptic number.

It is an amenable number.

209680148 is a deficient number, since it is larger than the sum of its proper divisors (157260118).

209680148 is a wasteful number, since it uses less digits than its factorization.

209680148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52420041 (or 52420039 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 209680148 is about 14480.3365982977. The cubic root of 209680148 is about 594.0902680744.

The spelling of 209680148 in words is "two hundred nine million, six hundred eighty thousand, one hundred forty-eight".