209072 has 20 divisors (see below), whose sum is σ = 412920. Its totient is φ = 102528.
The previous prime is 209071. The next prime is 209089. The reversal of 209072 is 270902.
It is a super-2 number, since 2×2090722 = 87422202368, which contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (209071) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079 + ... + 1257.
It is an arithmetic number, because the mean of its divisors is an integer number (20646).
2209072 is an apocalyptic number.
It is an amenable number.
209072 is a deficient number, since it is larger than the sum of its proper divisors (203848).
209072 is a wasteful number, since it uses less digits than its factorization.
209072 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 260 (or 254 counting only the distinct ones).
The product of its (nonzero) digits is 252, while the sum is 20.
The square root of 209072 is about 457.2439174008. The cubic root of 209072 is about 59.3515353264.
Adding to 209072 its reverse (270902), we get a palindrome (479974).
It can be divided in two parts, 20907 and 2, that multiplied together give a palindrome (41814).
The spelling of 209072 in words is "two hundred nine thousand, seventy-two".
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