16138589 has 4 divisors (see below), whose sum is σ = 16146780. Its totient is φ = 16130400.

The previous prime is 16138579. The next prime is 16138597. The reversal of 16138589 is 98583161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7198489 + 8940100 = 2683^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 16138589 - 2⁸ = 16138333 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 (16138519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857 + ... + 5745.

It is an arithmetic number, because the mean of its divisors is an integer number (4036695).

Almost surely, 2^16138589 is an apocalyptic number.

It is an amenable number.

16138589 is a deficient number, since it is larger than the sum of its proper divisors (8191).

16138589 is an equidigital number, since it uses as much as digits as its factorization.

16138589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190.

The product of its digits is 51840, while the sum is 41.

The square root of 16138589 is about 4017.2862730953. The cubic root of 16138589 is about 252.7096660651.

The spelling of 16138589 in words is "sixteen million, one hundred thirty-eight thousand, five hundred eighty-nine".