1900806409844 has 48 divisors (see below), whose sum is σ = 3481794753360. Its totient is φ = 907160601600.

The previous prime is 1900806409819. The next prime is 1900806409889. The reversal of 1900806409844 is 4489046080091.

It can be written as a sum of positive squares in 8 ways, for example, as 424241190244 + 1476565219600 = 651338^2 + 1215140^2 .

It is a super-2 number, since 2×1900806409844² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1046024 + ... + 2212640.

It is an arithmetic number, because the mean of its divisors is an integer number (72537390695).

Almost surely, 2^{1900806409844} is an apocalyptic number.

It is an amenable number.

1900806409844 is a deficient number, since it is larger than the sum of its proper divisors (1580988343516).

1900806409844 is a wasteful number, since it uses less digits than its factorization.

1900806409844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166868 (or 1166866 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 1900806409844 in words is "one trillion, nine hundred billion, eight hundred six million, four hundred nine thousand, eight hundred forty-four".