1818396205 has 8 divisors (see below), whose sum is σ = 2198003832. Its totient is φ = 1444098048.

The previous prime is 1818396187. The next prime is 1818396227. The reversal of 1818396205 is 5026938181.

1818396205 is digitally balanced in base 6, 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 245956489 + 1572439716 = 15683^2 + 39654^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1818396205 - 2²³ = 1810007597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1326612 + ... + 1327981.

It is an arithmetic number, because the mean of its divisors is an integer number (274750479).

Almost surely, 2^1818396205 is an apocalyptic number.

It is an amenable number.

1818396205 is a deficient number, since it is larger than the sum of its proper divisors (379607627).

1818396205 is a wasteful number, since it uses less digits than its factorization.

1818396205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654735.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1818396205 is about 42642.6571052977. The cubic root of 1818396205 is about 1220.5704143042.

The spelling of 1818396205 in words is "one billion, eight hundred eighteen million, three hundred ninety-six thousand, two hundred five".