209940258 has 32 divisors (see below), whose sum is σ = 467804160. Its totient is φ = 62263760.

The previous prime is 209940221. The next prime is 209940287. The reversal of 209940258 is 852049902.

It is an unprimeable number.

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, 30738 + ... + 36941.

It is an arithmetic number, because the mean of its divisors is an integer number (14618880).

Almost surely, 2^209940258 is an apocalyptic number.

209940258 is an abundant number, since it is smaller than the sum of its proper divisors (257863902).

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

209940258 is a wasteful number, since it uses less digits than its factorization.

209940258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67742.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 209940258 is about 14489.3153047340. The cubic root of 209940258 is about 594.3358245677.

The spelling of 209940258 in words is "two hundred nine million, nine hundred forty thousand, two hundred fifty-eight".