19918712 has 32 divisors (see below), whose sum is σ = 41040000. Its totient is φ = 8988000.

The previous prime is 19918711. The next prime is 19918721. The reversal of 19918712 is 21781991.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19918711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12539 + ... + 14037.

It is an arithmetic number, because the mean of its divisors is an integer number (1282500).

Almost surely, 2^19918712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19918712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20520000).

19918712 is an abundant number, since it is smaller than the sum of its proper divisors (21121288).

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

19918712 is a wasteful number, since it uses less digits than its factorization.

19918712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1663 counting only the distinct ones).

The product of its digits is 9072, while the sum is 38.

The square root of 19918712 is about 4463.0384269016. The cubic root of 19918712 is about 271.0735130060.

The spelling of 19918712 in words is "nineteen million, nine hundred eighteen thousand, seven hundred twelve".