209729982 has 32 divisors (see below), whose sum is σ = 522964224. Its totient is φ = 54475200.

The previous prime is 209729977. The next prime is 209729983. The reversal of 209729982 is 289927902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209729983) 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 15 ways as a sum of consecutive naturals, for example, 226519 + ... + 227442.

It is an arithmetic number, because the mean of its divisors is an integer number (16342632).

Almost surely, 2^209729982 is an apocalyptic number.

209729982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

209729982 is an abundant number, since it is smaller than the sum of its proper divisors (313234242).

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

209729982 is a wasteful number, since it uses less digits than its factorization.

209729982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453984.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 209729982 is about 14482.0572433615. The cubic root of 209729982 is about 594.1373295147.

The spelling of 209729982 in words is "two hundred nine million, seven hundred twenty-nine thousand, nine hundred eighty-two".