18034209 has 6 divisors (see below), whose sum is σ = 26049426. Its totient is φ = 12022800.

The previous prime is 18034193. The next prime is 18034217. The reversal of 18034209 is 90243081.

It can be written as a sum of positive squares in only one way, i.e., 15563025 + 2471184 = 3945^2 + 1572^2 .

It is not a de Polignac number, because 18034209 - 2⁴ = 18034193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18034279) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1001892 + ... + 1001909.

It is an arithmetic number, because the mean of its divisors is an integer number (4341571).

Almost surely, 2^18034209 is an apocalyptic number.

It is an amenable number.

18034209 is a deficient number, since it is larger than the sum of its proper divisors (8015217).

18034209 is a wasteful number, since it uses less digits than its factorization.

18034209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003807 (or 2003804 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18034209 is about 4246.6703427509. The cubic root of 18034209 is about 262.2400583229.

The spelling of 18034209 in words is "eighteen million, thirty-four thousand, two hundred nine".