209149444 has 27 divisors (see below), whose sum is σ = 426181077. Its totient is φ = 89548704.

The previous prime is 209149441. The next prime is 209149471. The reversal of 209149444 is 444941902.

The square root of 209149444 is 14462.

It is a perfect power (a square), and thus also a powerful number.

209149444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 201924100 + 7225344 = 14210^2 + 2688^2 .

It is not an unprimeable number, because it can be changed into a prime (209149441) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 201952 + ... + 202984.

Almost surely, 2^209149444 is an apocalyptic number.

209149444 is the 14462-nd square number.

It is an amenable number.

209149444 is an abundant number, since it is smaller than the sum of its proper divisors (217031633).

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

209149444 is an equidigital number, since it uses as much as digits as its factorization.

209149444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084 (or 1042 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The cubic root of 209149444 is about 593.5886271109.

The spelling of 209149444 in words is "two hundred nine million, one hundred forty-nine thousand, four hundred forty-four".