19981896 has 32 divisors (see below), whose sum is σ = 54496800. Its totient is φ = 6055040.

The previous prime is 19981891. The next prime is 19981933. The reversal of 19981896 is 69818991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19981891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37581 + ... + 38108.

It is an arithmetic number, because the mean of its divisors is an integer number (1703025).

Almost surely, 2^19981896 is an apocalyptic number.

It is an amenable number.

19981896 is an abundant number, since it is smaller than the sum of its proper divisors (34514904).

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

19981896 is a wasteful number, since it uses less digits than its factorization.

19981896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75709 (or 75705 counting only the distinct ones).

The product of its digits is 279936, while the sum is 51.

The square root of 19981896 is about 4470.1114080076. Note that the first 3 decimals coincide. The cubic root of 19981896 is about 271.3598339066.

The spelling of 19981896 in words is "nineteen million, nine hundred eighty-one thousand, eight hundred ninety-six".