1819272631338 has 24 divisors (see below), whose sum is σ = 3957094955268. Its totient is φ = 604064581632.

The previous prime is 1819272631327. The next prime is 1819272631361. The reversal of 1819272631338 is 8331362729181.

1819272631338 is a `hidden beast` number, since 1 + 8 + 1 + 9 + 272 + 6 + 31 + 338 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1208431908369 + 610840722969 = 1099287^2 + 781563^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196630981 + ... + 196640232.

Almost surely, 2^{1819272631338} is an apocalyptic number.

1819272631338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1819272631338 is an abundant number, since it is smaller than the sum of its proper divisors (2137822323930).

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

1819272631338 is a wasteful number, since it uses less digits than its factorization.

1819272631338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393271478 (or 393271475 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 1819272631338 in words is "one trillion, eight hundred nineteen billion, two hundred seventy-two million, six hundred thirty-one thousand, three hundred thirty-eight".