209530156 has 24 divisors (see below), whose sum is σ = 403981200. Its totient is φ = 94296000.

The previous prime is 209530109. The next prime is 209530193. The reversal of 209530156 is 651035902.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19131 + ... + 28018.

It is an arithmetic number, because the mean of its divisors is an integer number (16832550).

Almost surely, 2^209530156 is an apocalyptic number.

It is an amenable number.

209530156 is a deficient number, since it is larger than the sum of its proper divisors (194451044).

209530156 is a wasteful number, since it uses less digits than its factorization.

209530156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47265 (or 47263 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 209530156 is about 14475.1565103801. The cubic root of 209530156 is about 593.9485760030.

The spelling of 209530156 in words is "two hundred nine million, five hundred thirty thousand, one hundred fifty-six".