19981368 has 48 divisors (see below), whose sum is σ = 59038200. Its totient is φ = 6054720.

The previous prime is 19981361. The next prime is 19981373. The reversal of 19981368 is 86318991.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19981361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11823 + ... + 13406.

Almost surely, 2^19981368 is an apocalyptic number.

19981368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19981368 is an abundant number, since it is smaller than the sum of its proper divisors (39056832).

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

19981368 is a wasteful number, since it uses less digits than its factorization.

19981368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25252 (or 25245 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 19981368 is about 4470.0523486868. The cubic root of 19981368 is about 271.3574437555.

The spelling of 19981368 in words is "nineteen million, nine hundred eighty-one thousand, three hundred sixty-eight".