209536090 has 16 divisors (see below), whose sum is σ = 377411688. Its totient is φ = 83759616.

The previous prime is 209536087. The next prime is 209536091. The reversal of 209536090 is 90635902.

It is a happy number.

209536090 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 4 ways, for example, as 155027401 + 54508689 = 12451^2 + 7383^2 .

It is not an unprimeable number, because it can be changed into a prime (209536091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11554 + ... + 23506.

Almost surely, 2^209536090 is an apocalyptic number.

209536090 is a deficient number, since it is larger than the sum of its proper divisors (167875598).

209536090 is a wasteful number, since it uses less digits than its factorization.

209536090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13713.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 209536090 is about 14475.3614808059. The cubic root of 209536090 is about 593.9541829248.

The spelling of 209536090 in words is "two hundred nine million, five hundred thirty-six thousand, ninety".