209777082 has 16 divisors (see below), whose sum is σ = 419810880. Its totient is φ = 69882912.

The previous prime is 209777077. The next prime is 209777083. The reversal of 209777082 is 280777902.

It is not an unprimeable number, because it can be changed into a prime (209777083) 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 in 7 ways as a sum of consecutive naturals, for example, 894 + ... + 20502.

It is an arithmetic number, because the mean of its divisors is an integer number (26238180).

Almost surely, 2^209777082 is an apocalyptic number.

209777082 is an abundant number, since it is smaller than the sum of its proper divisors (210033798).

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

209777082 is a wasteful number, since it uses less digits than its factorization.

209777082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21397.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 209777082 is about 14483.6833022543. The cubic root of 209777082 is about 594.1818022115.

The spelling of 209777082 in words is "two hundred nine million, seven hundred seventy-seven thousand, eighty-two".