18035309 has 4 divisors (see below), whose sum is σ = 18044220. Its totient is φ = 18026400.

The previous prime is 18035299. The next prime is 18035323. The reversal of 18035309 is 90353081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11710084 + 6325225 = 3422^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 18035309 - 2⁸ = 18035053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18035359) 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, 209 + ... + 6009.

It is an arithmetic number, because the mean of its divisors is an integer number (4511055).

Almost surely, 2^18035309 is an apocalyptic number.

It is an amenable number.

18035309 is a deficient number, since it is larger than the sum of its proper divisors (8911).

18035309 is an equidigital number, since it uses as much as digits as its factorization.

18035309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8910.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 18035309 is about 4246.7998540077. The cubic root of 18035309 is about 262.2453900086.

The spelling of 18035309 in words is "eighteen million, thirty-five thousand, three hundred nine".