16189404 has 72 divisors (see below), whose sum is σ = 47956608. Its totient is φ = 4203360.

The previous prime is 16189403. The next prime is 16189417. The reversal of 16189404 is 40498161.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16189403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5217 + ... + 7719.

It is an arithmetic number, because the mean of its divisors is an integer number (666064).

Almost surely, 2^16189404 is an apocalyptic number.

16189404 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 16189404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23978304).

16189404 is an abundant number, since it is smaller than the sum of its proper divisors (31767204).

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

16189404 is a wasteful number, since it uses less digits than its factorization.

16189404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 16189404 is about 4023.6058455072. The cubic root of 16189404 is about 252.9746208145.

It can be divided in two parts, 16 and 189404, that added together give a triangular number (189420 = T₆₁₅).

The spelling of 16189404 in words is "sixteen million, one hundred eighty-nine thousand, four hundred four".