16662389 has 4 divisors (see below), whose sum is σ = 16681440. Its totient is φ = 16643340.

The previous prime is 16662343. The next prime is 16662403. The reversal of 16662389 is 98326661.

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 16662389 - 2²⁰ = 15613813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16662319) 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, 8147 + ... + 9984.

It is an arithmetic number, because the mean of its divisors is an integer number (4170360).

Almost surely, 2^16662389 is an apocalyptic number.

It is an amenable number.

16662389 is a deficient number, since it is larger than the sum of its proper divisors (19051).

16662389 is an equidigital number, since it uses as much as digits as its factorization.

16662389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19050.

The product of its digits is 93312, while the sum is 41.

The square root of 16662389 is about 4081.9589659868. The cubic root of 16662389 is about 255.4146221525.

The spelling of 16662389 in words is "sixteen million, six hundred sixty-two thousand, three hundred eighty-nine".