16606389 has 4 divisors (see below), whose sum is σ = 22141856. Its totient is φ = 11070924.

The previous prime is 16606363. The next prime is 16606397. The reversal of 16606389 is 98360661.

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 not a de Polignac number, because 16606389 - 2⁹ = 16605877 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 (16606339) 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, 2767729 + ... + 2767734.

It is an arithmetic number, because the mean of its divisors is an integer number (5535464).

Almost surely, 2^16606389 is an apocalyptic number.

It is an amenable number.

16606389 is a deficient number, since it is larger than the sum of its proper divisors (5535467).

16606389 is an equidigital number, since it uses as much as digits as its factorization.

16606389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5535466.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 16606389 is about 4075.0937412531. The cubic root of 16606389 is about 255.1281631791.

The spelling of 16606389 in words is "sixteen million, six hundred six thousand, three hundred eighty-nine".