19988304400 has 45 divisors (see below), whose sum is σ = 48028695591. Its totient is φ = 7994190720.

The previous prime is 19988304373. The next prime is 19988304409. The reversal of 19988304400 is 440388991.

The square root of 19988304400 is 141380.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1683296784 + 18305007616 = 41028^2 + 135296^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19988304409) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2824066 + ... + 2831134.

Almost surely, 2^19988304400 is an apocalyptic number.

19988304400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19988304400 is the 141380-th square number.

It is an amenable number.

19988304400 is an abundant number, since it is smaller than the sum of its proper divisors (28040391191).

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

19988304400 is an frugal number, since it uses more digits than its factorization.

19988304400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14156 (or 7076 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 19988304400 in words is "nineteen billion, nine hundred eighty-eight million, three hundred four thousand, four hundred".