1816811198 has 24 divisors (see below), whose sum is σ = 2975411880. Its totient is φ = 830909520.

The previous prime is 1816811197. The next prime is 1816811207. The reversal of 1816811198 is 8911186181.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816811197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22448 + ... + 64323.

It is an arithmetic number, because the mean of its divisors is an integer number (123975495).

Almost surely, 2^1816811198 is an apocalyptic number.

1816811198 is a deficient number, since it is larger than the sum of its proper divisors (1158600682).

1816811198 is a wasteful number, since it uses less digits than its factorization.

1816811198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86840 (or 86821 counting only the distinct ones).

The product of its digits is 27648, while the sum is 44.

The square root of 1816811198 is about 42624.0682948026. The cubic root of 1816811198 is about 1220.2156740446.

The spelling of 1816811198 in words is "one billion, eight hundred sixteen million, eight hundred eleven thousand, one hundred ninety-eight".