1998812836919 has 32 divisors (see below), whose sum is σ = 2174937882624. Its totient is φ = 1831396976640.

The previous prime is 1998812836901. The next prime is 1998812836931. The reversal of 1998812836919 is 9196382188991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998812836919 is a prime.

It is a super-2 number, since 2×1998812836919² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998812836519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193359719 + ... + 193370055.

It is an arithmetic number, because the mean of its divisors is an integer number (67966808832).

Almost surely, 2^{1998812836919} is an apocalyptic number.

1998812836919 is a deficient number, since it is larger than the sum of its proper divisors (176125045705).

1998812836919 is a wasteful number, since it uses less digits than its factorization.

1998812836919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13127.

The product of its digits is 120932352, while the sum is 74.

The spelling of 1998812836919 in words is "one trillion, nine hundred ninety-eight billion, eight hundred twelve million, eight hundred thirty-six thousand, nine hundred nineteen".