209189386252 has 72 divisors (see below), whose sum is σ = 477119392848. Its totient is φ = 79299561600.

The previous prime is 209189386201. The next prime is 209189386271. The reversal of 209189386252 is 252683981902.

It is a junction number, because it is equal to n+sod(n) for n = 209189386193 and 209189386202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1231399 + ... + 1390942.

It is an arithmetic number, because the mean of its divisors is an integer number (6626658234).

Almost surely, 2^209189386252 is an apocalyptic number.

209189386252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

209189386252 is an abundant number, since it is smaller than the sum of its proper divisors (267930006596).

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

209189386252 is a wasteful number, since it uses less digits than its factorization.

209189386252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622407 (or 2622398 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 209189386252 in words is "two hundred nine billion, one hundred eighty-nine million, three hundred eighty-six thousand, two hundred fifty-two".