19686612 has 96 divisors (see below), whose sum is σ = 54964224. Its totient is φ = 5414400.

The previous prime is 19686607. The next prime is 19686613. The reversal of 19686612 is 21668691.

19686612 = 149² + 150² + ... + 396².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19686613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69423 + ... + 69705.

It is an arithmetic number, because the mean of its divisors is an integer number (572544).

Almost surely, 2^19686612 is an apocalyptic number.

19686612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19686612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27482112).

19686612 is an abundant number, since it is smaller than the sum of its proper divisors (35277612).

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

19686612 is a wasteful number, since it uses less digits than its factorization.

19686612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 347 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 19686612 is about 4436.9597699326. The cubic root of 19686612 is about 270.0165147649.

It can be divided in two parts, 196866 and 12, that added together give a triangular number (196878 = T₆₂₇).

The spelling of 19686612 in words is "nineteen million, six hundred eighty-six thousand, six hundred twelve".