1809912808900 has 81 divisors (see below), whose sum is σ = 4568974779789. Its totient is φ = 620509246560.

The previous prime is 1809912808883. The next prime is 1809912808903. The reversal of 1809912808900 is 98082199081.

The square root of 1809912808900 is 1345330.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 651568611204 + 1158344197696 = 807198^2 + 1076264^2 .

It is not an unprimeable number, because it can be changed into a prime (1809912808903) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 94163491 + ... + 94182709.

Almost surely, 2^{1809912808900} is an apocalyptic number.

1809912808900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1809912808900 is the 1345330-th square number.

It is an amenable number.

1809912808900 is an abundant number, since it is smaller than the sum of its proper divisors (2759061970889).

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

1809912808900 is an frugal number, since it uses more digits than its factorization.

1809912808900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38466 (or 19233 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 55.

The spelling of 1809912808900 in words is "one trillion, eight hundred nine billion, nine hundred twelve million, eight hundred eight thousand, nine hundred".