209870252 has 12 divisors (see below), whose sum is σ = 367378536. Its totient is φ = 104904960.

The previous prime is 209870237. The next prime is 209870263. The reversal of 209870252 is 252078902.

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 3 ways as a sum of consecutive naturals, for example, 16943 + ... + 26585.

It is an arithmetic number, because the mean of its divisors is an integer number (30614878).

Almost surely, 2^209870252 is an apocalyptic number.

It is an amenable number.

209870252 is a deficient number, since it is larger than the sum of its proper divisors (157508284).

209870252 is a wasteful number, since it uses less digits than its factorization.

209870252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15088 (or 15086 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 209870252 is about 14486.8993231816. The cubic root of 209870252 is about 594.2697554556.

The spelling of 209870252 in words is "two hundred nine million, eight hundred seventy thousand, two hundred fifty-two".