19988430 has 128 divisors (see below), whose sum is σ = 63452160. Its totient is φ = 3901440.

The previous prime is 19988429. The next prime is 19988461. The reversal of 19988430 is 3488991.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39016 + ... + 39524.

It is an arithmetic number, because the mean of its divisors is an integer number (495720).

Almost surely, 2^19988430 is an apocalyptic number.

19988430 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 19988430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31726080).

19988430 is an abundant number, since it is smaller than the sum of its proper divisors (43463730).

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

19988430 is a wasteful number, since it uses less digits than its factorization.

19988430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 19988430 is about 4470.8422025386. The cubic root of 19988430 is about 271.3894085431.

The spelling of 19988430 in words is "nineteen million, nine hundred eighty-eight thousand, four hundred thirty".