19881416 has 16 divisors (see below), whose sum is σ = 38480640. Its totient is φ = 9619920.

The previous prime is 19881403. The next prime is 19881419. The reversal of 19881416 is 61418891.

It is a self number, because there is not a number n which added to its sum of digits gives 19881416.

It is not an unprimeable number, because it can be changed into a prime (19881419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39836 + ... + 40331.

It is an arithmetic number, because the mean of its divisors is an integer number (2405040).

Almost surely, 2^19881416 is an apocalyptic number.

It is an amenable number.

19881416 is a deficient number, since it is larger than the sum of its proper divisors (18599224).

19881416 is a wasteful number, since it uses less digits than its factorization.

19881416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80204 (or 80200 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 19881416 is about 4458.8581497958. The cubic root of 19881416 is about 270.9042203611.

The spelling of 19881416 in words is "nineteen million, eight hundred eighty-one thousand, four hundred sixteen".