18316205 has 4 divisors (see below), whose sum is σ = 21979452. Its totient is φ = 14652960.

The previous prime is 18316201. The next prime is 18316213. The reversal of 18316205 is 50261381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50261381 = 643 ⋅78167.

It can be written as a sum of positive squares in 2 ways, for example, as 13053769 + 5262436 = 3613^2 + 2294^2 .

It is not a de Polignac number, because 18316205 - 2² = 18316201 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 (18316201) 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, 1831616 + ... + 1831625.

It is an arithmetic number, because the mean of its divisors is an integer number (5494863).

Almost surely, 2^18316205 is an apocalyptic number.

It is an amenable number.

18316205 is a deficient number, since it is larger than the sum of its proper divisors (3663247).

18316205 is an equidigital number, since it uses as much as digits as its factorization.

18316205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663246.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 18316205 is about 4279.7435670844. The cubic root of 18316205 is about 263.5998538964.

Adding to 18316205 its reverse (50261381), we get a palindrome (68577586).

The spelling of 18316205 in words is "eighteen million, three hundred sixteen thousand, two hundred five".