19981104 has 160 divisors (see below), whose sum is σ = 62995968. Its totient is φ = 5376000.

The previous prime is 19981079. The next prime is 19981109. The reversal of 19981104 is 40118991.

19981104 = 678² + 679² + ... + 718².

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (19981109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281389 + ... + 281459.

Almost surely, 2^19981104 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 19981104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31497984).

19981104 is an abundant number, since it is smaller than the sum of its proper divisors (43014864).

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

19981104 is a wasteful number, since it uses less digits than its factorization.

19981104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 19981104 is about 4470.0228187337. The cubic root of 19981104 is about 271.3562486641.

The spelling of 19981104 in words is "nineteen million, nine hundred eighty-one thousand, one hundred four".