19998750 has 40 divisors (see below), whose sum is σ = 49990248. Its totient is φ = 5332000.

The previous prime is 19998743. The next prime is 19998757. The reversal of 19998750 is 5789991.

It is an interprime number because it is at equal distance from previous prime (19998743) and next prime (19998757).

It is a self number, because there is not a number n which added to its sum of digits gives 19998750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998757) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1084 + ... + 6416.

Almost surely, 2^19998750 is an apocalyptic number.

19998750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19998750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24995124).

19998750 is an abundant number, since it is smaller than the sum of its proper divisors (29991498).

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

19998750 is an equidigital number, since it uses as much as digits as its factorization.

19998750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358 (or 5343 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 19998750 is about 4471.9961985673. The cubic root of 19998750 is about 271.4361065050.

The spelling of 19998750 in words is "nineteen million, nine hundred ninety-eight thousand, seven hundred fifty".