16105989 has 16 divisors (see below), whose sum is σ = 22599360. Its totient is φ = 10189440.

The previous prime is 16105963. The next prime is 16105993. The reversal of 16105989 is 98950161.

It is not a de Polignac number, because 16105989 - 2⁷ = 16105861 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16105909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2782 + ... + 6320.

It is an arithmetic number, because the mean of its divisors is an integer number (1412460).

Almost surely, 2^16105989 is an apocalyptic number.

It is an amenable number.

16105989 is a deficient number, since it is larger than the sum of its proper divisors (6493371).

16105989 is a wasteful number, since it uses less digits than its factorization.

16105989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 16105989 is about 4013.2267566137. The cubic root of 16105989 is about 252.5393932591.

The spelling of 16105989 in words is "sixteen million, one hundred five thousand, nine hundred eighty-nine".