19798000 has 80 divisors (see below), whose sum is σ = 50487840. Its totient is φ = 7488000.

The previous prime is 19797989. The next prime is 19798001. The reversal of 19798000 is 89791.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19798001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37740 + ... + 38260.

It is an arithmetic number, because the mean of its divisors is an integer number (631098).

Almost surely, 2^19798000 is an apocalyptic number.

19798000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19798000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25243920).

19798000 is an abundant number, since it is smaller than the sum of its proper divisors (30689840).

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

19798000 is a wasteful number, since it uses less digits than its factorization.

19798000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 19798000 is about 4449.4943532945. The cubic root of 19798000 is about 270.5248137065.

The spelling of 19798000 in words is "nineteen million, seven hundred ninety-eight thousand".