209569142 has 8 divisors (see below), whose sum is σ = 317466432. Its totient is φ = 103747000.

The previous prime is 209569127. The next prime is 209569159. The reversal of 209569142 is 241965902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 209569096 and 209569105.

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 in 3 ways as a sum of consecutive naturals, for example, 518534 + ... + 518937.

It is an arithmetic number, because the mean of its divisors is an integer number (39683304).

Almost surely, 2^209569142 is an apocalyptic number.

209569142 is a deficient number, since it is larger than the sum of its proper divisors (107897290).

209569142 is a wasteful number, since it uses less digits than its factorization.

209569142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037574.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 209569142 is about 14476.5030998512. The cubic root of 209569142 is about 593.9854111832.

The spelling of 209569142 in words is "two hundred nine million, five hundred sixty-nine thousand, one hundred forty-two".