1809899712 has 42 divisors (see below), whose sum is σ = 5187752388. Its totient is φ = 603299712.

The previous prime is 1809899687. The next prime is 1809899761. The reversal of 1809899712 is 2179989081.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1570518 + ... + 1571669.

It is an arithmetic number, because the mean of its divisors is an integer number (123517914).

Almost surely, 2^1809899712 is an apocalyptic number.

1809899712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1809899712 is an abundant number, since it is smaller than the sum of its proper divisors (3377852676).

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

1809899712 is a wasteful number, since it uses less digits than its factorization.

1809899712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142205 (or 3142192 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 1809899712 is about 42542.9161200781. The cubic root of 1809899712 is about 1218.6663990623. Note that the first 3 decimals are identical.

The spelling of 1809899712 in words is "one billion, eight hundred nine million, eight hundred ninety-nine thousand, seven hundred twelve".