19209904 has 20 divisors (see below), whose sum is σ = 42536464. Its totient is φ = 8232768.

The previous prime is 19209871. The next prime is 19209913. The reversal of 19209904 is 40990291.

It is a self number, because there is not a number n which added to its sum of digits gives 19209904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85647 + ... + 85870.

Almost surely, 2^19209904 is an apocalyptic number.

19209904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19209904 is an abundant number, since it is smaller than the sum of its proper divisors (23326560).

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

19209904 is a wasteful number, since it uses less digits than its factorization.

19209904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171532 (or 171526 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 19209904 is about 4382.9104485490. The cubic root of 19209904 is about 267.8192142291.

The spelling of 19209904 in words is "nineteen million, two hundred nine thousand, nine hundred four".