19404 has 54 divisors (see below), whose sum is σ = 62244. Its totient is φ = 5040.

The previous prime is 19403. The next prime is 19417. The reversal of 19404 is 40491.

19404 is nontrivially palindromic in base 13.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 16.

It is a nialpdrome in base 14.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (19403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1759 + ... + 1769.

2¹⁹⁴⁰⁴ is an apocalyptic number.

19404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31122).

19404 is an abundant number, since it is smaller than the sum of its proper divisors (42840).

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

19404 is a wasteful number, since it uses less digits than its factorization.

19404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 19404 is about 139.2982411949. The cubic root of 19404 is about 26.8718204279.

Adding to 19404 its reverse (40491), we get a palindrome (59895).

The spelling of 19404 in words is "nineteen thousand, four hundred four".