16805889 has 6 divisors (see below), whose sum is σ = 24275186. Its totient is φ = 11203920.

The previous prime is 16805879. The next prime is 16805891. The reversal of 16805889 is 98850861.

16805889 is a `hidden beast` number, since 1 + 68 + 0 + 588 + 9 = 666.

16805889 is nontrivially palindromic in base 8 and base 16.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 36864 = 4095^2 + 192^2 .

It is not a de Polignac number, because 16805889 - 2¹² = 16801793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16805839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 933652 + ... + 933669.

Almost surely, 2^16805889 is an apocalyptic number.

It is an amenable number.

16805889 is a deficient number, since it is larger than the sum of its proper divisors (7469297).

16805889 is a wasteful number, since it uses less digits than its factorization.

16805889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867327 (or 1867324 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 16805889 is about 4099.4986278812. The cubic root of 16805889 is about 256.1457554170.

It can be divided in two parts, 1680 and 5889, that added together give a square (7569 = 87²).

The spelling of 16805889 in words is "sixteen million, eight hundred five thousand, eight hundred eighty-nine".