19871212 has 6 divisors (see below), whose sum is σ = 34774628. Its totient is φ = 9935604.

The previous prime is 19871197. The next prime is 19871213. The reversal of 19871212 is 21217891.

It is not an unprimeable number, because it can be changed into a prime (19871213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2483898 + ... + 2483905.

Almost surely, 2^19871212 is an apocalyptic number.

It is an amenable number.

19871212 is a deficient number, since it is larger than the sum of its proper divisors (14903416).

19871212 is a wasteful number, since it uses less digits than its factorization.

19871212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4967807 (or 4967805 counting only the distinct ones).

The product of its digits is 2016, while the sum is 31.

The square root of 19871212 is about 4457.7137638031. The cubic root of 19871212 is about 270.8578658540.

The spelling of 19871212 in words is "nineteen million, eight hundred seventy-one thousand, two hundred twelve".