19999912 has 8 divisors (see below), whose sum is σ = 37499850. Its totient is φ = 9999952.

The previous prime is 19999909. The next prime is 19999927. The reversal of 19999912 is 21999991.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 54756 = 4466^2 + 234^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249987 + ... + 1250002.

Almost surely, 2^19999912 is an apocalyptic number.

It is an amenable number.

19999912 is a deficient number, since it is larger than the sum of its proper divisors (17499938).

19999912 is a wasteful number, since it uses less digits than its factorization.

19999912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499995 (or 2499991 counting only the distinct ones).

The product of its digits is 118098, while the sum is 49.

The square root of 19999912 is about 4472.1261162897. The cubic root of 19999912 is about 271.4413635443.

It can be divided in two parts, 1999 and 9912, that added together give a palindrome (11911).

The spelling of 19999912 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred twelve".