16505889 has 8 divisors (see below), whose sum is σ = 23166240. Its totient is φ = 10424736.

The previous prime is 16505837. The next prime is 16505911. The reversal of 16505889 is 98850561.

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

It is not a de Polignac number, because 16505889 - 2¹¹ = 16503841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16505889.

It is not an unprimeable number, because it can be changed into a prime (16505389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144732 + ... + 144845.

It is an arithmetic number, because the mean of its divisors is an integer number (2895780).

Almost surely, 2^16505889 is an apocalyptic number.

16505889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16505889 is a deficient number, since it is larger than the sum of its proper divisors (6660351).

16505889 is a wasteful number, since it uses less digits than its factorization.

16505889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289599.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 16505889 is about 4062.7440234403. The cubic root of 16505889 is about 254.6124524438.

The spelling of 16505889 in words is "sixteen million, five hundred five thousand, eight hundred eighty-nine".