19816089 has 4 divisors (see below), whose sum is σ = 26421456. Its totient is φ = 13210724.

The previous prime is 19816081. The next prime is 19816109. The reversal of 19816089 is 98061891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19816089 - 2³ = 19816081 is a prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 19816089.

It is not an unprimeable number, because it can be changed into a prime (19816081) 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, 3302679 + ... + 3302684.

It is an arithmetic number, because the mean of its divisors is an integer number (6605364).

Almost surely, 2^19816089 is an apocalyptic number.

It is an amenable number.

19816089 is a deficient number, since it is larger than the sum of its proper divisors (6605367).

19816089 is an equidigital number, since it uses as much as digits as its factorization.

19816089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6605366.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 19816089 is about 4451.5265920805. The cubic root of 19816089 is about 270.6071794967.

The spelling of 19816089 in words is "nineteen million, eight hundred sixteen thousand, eighty-nine".