19304009 has 4 divisors (see below), whose sum is σ = 19481220. Its totient is φ = 19126800.

The previous prime is 19304003. The next prime is 19304023. The reversal of 19304009 is 90040391.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8248384 + 11055625 = 2872^2 + 3325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19304009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19304003) by changing a digit.

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, 88442 + ... + 88659.

It is an arithmetic number, because the mean of its divisors is an integer number (4870305).

Almost surely, 2^19304009 is an apocalyptic number.

It is an amenable number.

19304009 is a deficient number, since it is larger than the sum of its proper divisors (177211).

19304009 is a wasteful number, since it uses less digits than its factorization.

19304009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177210.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 19304009 is about 4393.6327793752. The cubic root of 19304009 is about 268.2558307435.

The spelling of 19304009 in words is "nineteen million, three hundred four thousand, nine".