19604009 has 4 divisors (see below), whose sum is σ = 20757204. Its totient is φ = 18450816.

The previous prime is 19603979. The next prime is 19604021. The reversal of 19604009 is 90040691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90040691 = 13 ⋅6926207.

It can be written as a sum of positive squares in 2 ways, for example, as 13213225 + 6390784 = 3635^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 19604009 - 2¹² = 19599913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19604069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576572 + ... + 576605.

It is an arithmetic number, because the mean of its divisors is an integer number (5189301).

Almost surely, 2^19604009 is an apocalyptic number.

It is an amenable number.

19604009 is a deficient number, since it is larger than the sum of its proper divisors (1153195).

19604009 is a wasteful number, since it uses less digits than its factorization.

19604009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153194.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 19604009 is about 4427.6414714834. The cubic root of 19604009 is about 269.6383314859.

The spelling of 19604009 in words is "nineteen million, six hundred four thousand, nine".