19881408 has 28 divisors (see below), whose sum is σ = 52603400. Its totient is φ = 6627072.

The previous prime is 19881403. The next prime is 19881419. The reversal of 19881408 is 80418891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19881403) 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 3 ways as a sum of consecutive naturals, for example, 51583 + ... + 51966.

Almost surely, 2^19881408 is an apocalyptic number.

It is an amenable number.

19881408 is an abundant number, since it is smaller than the sum of its proper divisors (32721992).

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

19881408 is a wasteful number, since it uses less digits than its factorization.

19881408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103564 (or 103554 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 19881408 is about 4458.8572527050. The cubic root of 19881408 is about 270.9041840251.

The spelling of 19881408 in words is "nineteen million, eight hundred eighty-one thousand, four hundred eight".