1819459818 has 72 divisors (see below), whose sum is σ = 4406875200. Its totient is φ = 541968240.

The previous prime is 1819459787. The next prime is 1819459861. The reversal of 1819459818 is 8189549181.

1819459818 is a `hidden beast` number, since 181 + 9 + 459 + 8 + 1 + 8 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 121423 + ... + 135581.

It is an arithmetic number, because the mean of its divisors is an integer number (61206600).

Almost surely, 2^1819459818 is an apocalyptic number.

1819459818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1819459818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203437600).

1819459818 is an abundant number, since it is smaller than the sum of its proper divisors (2587415382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1819459818 is a wasteful number, since it uses less digits than its factorization.

1819459818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14248 (or 14234 counting only the distinct ones).

The product of its digits is 829440, while the sum is 54.

The square root of 1819459818 is about 42655.1265148751. The cubic root of 1819459818 is about 1220.8083458621.

The spelling of 1819459818 in words is "one billion, eight hundred nineteen million, four hundred fifty-nine thousand, eight hundred eighteen".