19889065 has 16 divisors (see below), whose sum is σ = 28881792. Its totient is φ = 12835584.

The previous prime is 19889057. The next prime is 19889081. The reversal of 19889065 is 56098891.

It is a cyclic number.

It is not a de Polignac number, because 19889065 - 2³ = 19889057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16119 + ... + 17308.

It is an arithmetic number, because the mean of its divisors is an integer number (1805112).

Almost surely, 2^19889065 is an apocalyptic number.

It is an amenable number.

19889065 is a deficient number, since it is larger than the sum of its proper divisors (8992727).

19889065 is a wasteful number, since it uses less digits than its factorization.

19889065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33456.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 19889065 is about 4459.7157981199. The cubic root of 19889065 is about 270.9389576706.

The spelling of 19889065 in words is "nineteen million, eight hundred eighty-nine thousand, sixty-five".