19868 has 6 divisors (see below), whose sum is σ = 34776. Its totient is φ = 9932.

The previous prime is 19867. The next prime is 19889. The reversal of 19868 is 86891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2480 + ... + 2487.

It is an arithmetic number, because the mean of its divisors is an integer number (5796).

2¹⁹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

19868 is a deficient number, since it is larger than the sum of its proper divisors (14908).

19868 is a wasteful number, since it uses less digits than its factorization.

19868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4971 (or 4969 counting only the distinct ones).

The product of its digits is 3456, while the sum is 32.

The square root of 19868 is about 140.9538931708. The cubic root of 19868 is about 27.0843271167.

Adding to 19868 its sum of digits (32), we get a triangular number (19900 = T₁₉₉).

The spelling of 19868 in words is "nineteen thousand, eight hundred sixty-eight".