1812738833438 has 32 divisors (see below), whose sum is σ = 2936329504416. Its totient is φ = 834349114368.

The previous prime is 1812738833417. The next prime is 1812738833443. The reversal of 1812738833438 is 8343388372181.

It is a super-2 number, since 2×1812738833438² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14538770 + ... + 14662922.

It is an arithmetic number, because the mean of its divisors is an integer number (91760297013).

Almost surely, 2^{1812738833438} is an apocalyptic number.

1812738833438 is a deficient number, since it is larger than the sum of its proper divisors (1123590670978).

1812738833438 is a wasteful number, since it uses less digits than its factorization.

1812738833438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125708.

The product of its digits is 18579456, while the sum is 59.

The spelling of 1812738833438 in words is "one trillion, eight hundred twelve billion, seven hundred thirty-eight million, eight hundred thirty-three thousand, four hundred thirty-eight".