1818394311 has 16 divisors (see below), whose sum is σ = 2504245248. Its totient is φ = 1172450400.

The previous prime is 1818394309. The next prime is 1818394339. The reversal of 1818394311 is 1134938181.

It is not a de Polignac number, because 1818394311 - 2¹ = 1818394309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1818394311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818394381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180826 + ... + 190616.

It is an arithmetic number, because the mean of its divisors is an integer number (156515328).

Almost surely, 2^1818394311 is an apocalyptic number.

1818394311 is a deficient number, since it is larger than the sum of its proper divisors (685850937).

1818394311 is a wasteful number, since it uses less digits than its factorization.

1818394311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11822.

The product of its digits is 20736, while the sum is 39.

The square root of 1818394311 is about 42642.6348974826. The cubic root of 1818394311 is about 1220.5699905313.

The spelling of 1818394311 in words is "one billion, eight hundred eighteen million, three hundred ninety-four thousand, three hundred eleven".