1809864012 has 48 divisors (see below), whose sum is σ = 4609713024. Its totient is φ = 548112000.

The previous prime is 1809863971. The next prime is 1809864029. The reversal of 1809864012 is 2104689081.

It is a super-2 number, since 2×1809864012² = 6551215483865472288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298087 + ... + 304097.

It is an arithmetic number, because the mean of its divisors is an integer number (96035688).

Almost surely, 2^1809864012 is an apocalyptic number.

1809864012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1809864012 is an abundant number, since it is smaller than the sum of its proper divisors (2799849012).

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

1809864012 is a wasteful number, since it uses less digits than its factorization.

1809864012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310 (or 8308 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1809864012 is about 42542.4965416935. The cubic root of 1809864012 is about 1218.6583863391.

The spelling of 1809864012 in words is "one billion, eight hundred nine million, eight hundred sixty-four thousand, twelve".