16290209 has 4 divisors (see below), whose sum is σ = 17543316. Its totient is φ = 15037104.

The previous prime is 16290203. The next prime is 16290217. The reversal of 16290209 is 90209261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90209261 = 101 ⋅893161.

It can be written as a sum of positive squares in 2 ways, for example, as 7139584 + 9150625 = 2672^2 + 3025^2 .

It is a cyclic number.

It is not a de Polignac number, because 16290209 - 2¹² = 16286113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16290203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626534 + ... + 626559.

It is an arithmetic number, because the mean of its divisors is an integer number (4385829).

Almost surely, 2^16290209 is an apocalyptic number.

It is an amenable number.

16290209 is a deficient number, since it is larger than the sum of its proper divisors (1253107).

16290209 is a wasteful number, since it uses less digits than its factorization.

16290209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253106.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 16290209 is about 4036.1131054518. The cubic root of 16290209 is about 253.4985923488.

The spelling of 16290209 in words is "sixteen million, two hundred ninety thousand, two hundred nine".