19589989 has 4 divisors (see below), whose sum is σ = 19714924. Its totient is φ = 19465056.

The previous prime is 19589987. The next prime is 19590013. The reversal of 19589989 is 98998591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98998591 = 47 ⋅2106353.

It can be written as a sum of positive squares in 2 ways, for example, as 9253764 + 10336225 = 3042^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 19589989 - 2¹ = 19589987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19589981) 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, 62232 + ... + 62545.

It is an arithmetic number, because the mean of its divisors is an integer number (4928731).

Almost surely, 2^19589989 is an apocalyptic number.

It is an amenable number.

19589989 is a deficient number, since it is larger than the sum of its proper divisors (124935).

19589989 is a wasteful number, since it uses less digits than its factorization.

19589989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124934.

The product of its digits is 2099520, while the sum is 58.

The square root of 19589989 is about 4426.0579526256. The cubic root of 19589989 is about 269.5740379879.

The spelling of 19589989 in words is "nineteen million, five hundred eighty-nine thousand, nine hundred eighty-nine".