19799868 has 48 divisors (see below), whose sum is σ = 51246720. Its totient is φ = 5899200.

The previous prime is 19799861. The next prime is 19799873. The reversal of 19799868 is 86899791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19799861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6823 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (1067640).

Almost surely, 2^19799868 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 19799868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25623360).

19799868 is an abundant number, since it is smaller than the sum of its proper divisors (31446852).

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

19799868 is a wasteful number, since it uses less digits than its factorization.

19799868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538 (or 2536 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 57.

The square root of 19799868 is about 4449.7042598357. The cubic root of 19799868 is about 270.5333217117.

The spelling of 19799868 in words is "nineteen million, seven hundred ninety-nine thousand, eight hundred sixty-eight".