209031372 has 108 divisors (see below), whose sum is σ = 593724768. Its totient is φ = 61934400.

The previous prime is 209031359. The next prime is 209031373. The reversal of 209031372 is 273130902.

It is a super-2 number, since 2×209031372² = 87388228960404768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209031373) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 204222 + ... + 205242.

Almost surely, 2^209031372 is an apocalyptic number.

209031372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209031372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296862384).

209031372 is an abundant number, since it is smaller than the sum of its proper divisors (384693396).

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

209031372 is a wasteful number, since it uses less digits than its factorization.

209031372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 209031372 is about 14457.9172773951. The cubic root of 209031372 is about 593.4769057378.

The spelling of 209031372 in words is "two hundred nine million, thirty-one thousand, three hundred seventy-two".