18691712 has 64 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 8408064.

The previous prime is 18691711. The next prime is 18691741. The reversal of 18691712 is 21719681.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (18691711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78089 + ... + 78327.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

Almost surely, 2^18691712 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 18691712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20563200).

18691712 is an abundant number, since it is smaller than the sum of its proper divisors (22434688).

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

18691712 is a wasteful number, since it uses less digits than its factorization.

18691712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 301 counting only the distinct ones).

The product of its digits is 6048, while the sum is 35.

The square root of 18691712 is about 4323.3912614983. The cubic root of 18691712 is about 265.3890665705.

The spelling of 18691712 in words is "eighteen million, six hundred ninety-one thousand, seven hundred twelve".