19986212 has 6 divisors (see below), whose sum is σ = 34975878. Its totient is φ = 9993104.

The previous prime is 19986193. The next prime is 19986251. The reversal of 19986212 is 21268991.

It can be written as a sum of positive squares in only one way, i.e., 19307236 + 678976 = 4394^2 + 824^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2498273 + ... + 2498280.

It is an arithmetic number, because the mean of its divisors is an integer number (5829313).

Almost surely, 2^19986212 is an apocalyptic number.

It is an amenable number.

19986212 is a deficient number, since it is larger than the sum of its proper divisors (14989666).

19986212 is a wasteful number, since it uses less digits than its factorization.

19986212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4996557 (or 4996555 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 19986212 is about 4470.5941439589. The cubic root of 19986212 is about 271.3793700029.

The spelling of 19986212 in words is "nineteen million, nine hundred eighty-six thousand, two hundred twelve".