16389865 has 8 divisors (see below), whose sum is σ = 19696320. Its totient is φ = 13092912.

The previous prime is 16389833. The next prime is 16389883. The reversal of 16389865 is 56898361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16389865 - 2⁵ = 16389833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2242 + ... + 6148.

It is an arithmetic number, because the mean of its divisors is an integer number (2462040).

Almost surely, 2^16389865 is an apocalyptic number.

It is an amenable number.

16389865 is a deficient number, since it is larger than the sum of its proper divisors (3306455).

16389865 is an equidigital number, since it uses as much as digits as its factorization.

16389865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4751.

The product of its digits is 311040, while the sum is 46.

The square root of 16389865 is about 4048.4398229441. The cubic root of 16389865 is about 254.0144710378.

The spelling of 16389865 in words is "sixteen million, three hundred eighty-nine thousand, eight hundred sixty-five".