1813820844400 has 60 divisors (see below), whose sum is σ = 4439925471672. Its totient is φ = 711839115520.

The previous prime is 1813820844377. The next prime is 1813820844403. The reversal of 1813820844400 is 44480283181.

It is a super-2 number, since 2×1813820844400² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813820844403) 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, 42757594 + ... + 42799993.

Almost surely, 2^{1813820844400} is an apocalyptic number.

1813820844400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1813820844400 is an abundant number, since it is smaller than the sum of its proper divisors (2626104627272).

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

1813820844400 is a wasteful number, since it uses less digits than its factorization.

1813820844400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85557658 (or 85557647 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 43.

The spelling of 1813820844400 in words is "one trillion, eight hundred thirteen billion, eight hundred twenty million, eight hundred forty-four thousand, four hundred".