190904 has 24 divisors (see below), whose sum is σ = 417240. Its totient is φ = 81648.

The previous prime is 190901. The next prime is 190909. The reversal of 190904 is 409091.

190904 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 190904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 149 + ... + 635.

It is an arithmetic number, because the mean of its divisors is an integer number (17385).

2¹⁹⁰⁹⁰⁴ is an apocalyptic number.

190904 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 190904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208620).

190904 is an abundant number, since it is smaller than the sum of its proper divisors (226336).

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

190904 is a wasteful number, since it uses less digits than its factorization.

190904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 190904 is about 436.9256229612. The cubic root of 190904 is about 57.5800020598.

Adding to 190904 its reverse (409091), we get a palindrome (599995).

The spelling of 190904 in words is "one hundred ninety thousand, nine hundred four".