19688089 has 4 divisors (see below), whose sum is σ = 19791360. Its totient is φ = 19584820.

The previous prime is 19688063. The next prime is 19688101. The reversal of 19688089 is 98088691.

It is a happy number.

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 19688089 - 2⁷ = 19687961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19688029) 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, 51349 + ... + 51730.

It is an arithmetic number, because the mean of its divisors is an integer number (4947840).

Almost surely, 2^19688089 is an apocalyptic number.

It is an amenable number.

19688089 is a deficient number, since it is larger than the sum of its proper divisors (103271).

19688089 is a wasteful number, since it uses less digits than its factorization.

19688089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103270.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 19688089 is about 4437.1262096091. The cubic root of 19688089 is about 270.0232673136.

The spelling of 19688089 in words is "nineteen million, six hundred eighty-eight thousand, eighty-nine".