19909135 has 4 divisors (see below), whose sum is σ = 23890968. Its totient is φ = 15927304.

The previous prime is 19909121. The next prime is 19909139. The reversal of 19909135 is 53190991.

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

It is a cyclic number.

It is not a de Polignac number, because 19909135 - 2⁵ = 19909103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19909094 and 19909103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909139) 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, 1990909 + ... + 1990918.

It is an arithmetic number, because the mean of its divisors is an integer number (5972742).

Almost surely, 2^19909135 is an apocalyptic number.

19909135 is a deficient number, since it is larger than the sum of its proper divisors (3981833).

19909135 is an equidigital number, since it uses as much as digits as its factorization.

19909135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981832.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 19909135 is about 4461.9653741373. The cubic root of 19909135 is about 271.0300616153.

The spelling of 19909135 in words is "nineteen million, nine hundred nine thousand, one hundred thirty-five".