19999812 has 24 divisors (see below), whose sum is σ = 53333056. Its totient is φ = 5714208.

The previous prime is 19999789. The next prime is 19999817. The reversal of 19999812 is 21899991.

It is not an unprimeable number, because it can be changed into a prime (19999817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118963 + ... + 119130.

Almost surely, 2^19999812 is an apocalyptic number.

19999812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19999812 is an abundant number, since it is smaller than the sum of its proper divisors (33333244).

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

19999812 is a wasteful number, since it uses less digits than its factorization.

19999812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238107 (or 238105 counting only the distinct ones).

The product of its digits is 104976, while the sum is 48.

The square root of 19999812 is about 4472.1149359112. The cubic root of 19999812 is about 271.4409111393.

It can be divided in two parts, 1999 and 9812, that added together give a palindrome (11811).

The spelling of 19999812 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred twelve".