209472227188 has 36 divisors (see below), whose sum is σ = 433653181920. Its totient is φ = 88252216752.

The previous prime is 209472227119. The next prime is 209472227213. The reversal of 209472227188 is 881722274902.

It is a super-2 number, since 2×209472227188² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9045520 + ... + 9068647.

It is an arithmetic number, because the mean of its divisors is an integer number (12045921720).

Almost surely, 2^209472227188 is an apocalyptic number.

209472227188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209472227188 is an abundant number, since it is smaller than the sum of its proper divisors (224180954732).

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

209472227188 is a wasteful number, since it uses less digits than its factorization.

209472227188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18114244 (or 18114235 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 209472227188 in words is "two hundred nine billion, four hundred seventy-two million, two hundred twenty-seven thousand, one hundred eighty-eight".