209107072 has 32 divisors (see below), whose sum is σ = 441089820. Its totient is φ = 98402304.

The previous prime is 209107069. The next prime is 209107079. The reversal of 209107072 is 270701902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 203461696 + 5645376 = 14264^2 + 2376^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 209107072.

It is not an unprimeable number, because it can be changed into a prime (209107079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45873 + ... + 50224.

Almost surely, 2^209107072 is an apocalyptic number.

It is an amenable number.

209107072 is an abundant number, since it is smaller than the sum of its proper divisors (231982748).

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

209107072 is an equidigital number, since it uses as much as digits as its factorization.

209107072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96128 (or 96116 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 209107072 is about 14460.5349831879. The cubic root of 209107072 is about 593.5485389718.

Adding to 209107072 its reverse (270701902), we get a palindrome (479808974).

The spelling of 209107072 in words is "two hundred nine million, one hundred seven thousand, seventy-two".