19680388 has 36 divisors (see below), whose sum is σ = 42631680. Its totient is φ = 7783776.

The previous prime is 19680383. The next prime is 19680389. The reversal of 19680388 is 88308691.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19680383) 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, 2653 + ... + 6811.

Almost surely, 2^19680388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19680388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21315840).

19680388 is an abundant number, since it is smaller than the sum of its proper divisors (22951292).

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

19680388 is a wasteful number, since it uses less digits than its factorization.

19680388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4196 (or 4181 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 19680388 is about 4436.2583333255. The cubic root of 19680388 is about 269.9880561703.

The spelling of 19680388 in words is "nineteen million, six hundred eighty thousand, three hundred eighty-eight".