16011989 has 8 divisors (see below), whose sum is σ = 18645120. Its totient is φ = 13465296.

The previous prime is 16011971. The next prime is 16011997. The reversal of 16011989 is 98911061.

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 16011989 - 2⁸ = 16011733 is a prime.

It is a super-2 number, since 2×16011989² = 512767583472242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16010989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21209 + ... + 21950.

It is an arithmetic number, because the mean of its divisors is an integer number (2330640).

Almost surely, 2^16011989 is an apocalyptic number.

It is an amenable number.

16011989 is a deficient number, since it is larger than the sum of its proper divisors (2633131).

16011989 is an equidigital number, since it uses as much as digits as its factorization.

16011989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43219.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 16011989 is about 4001.4983443705. The cubic root of 16011989 is about 252.0471325715.

The spelling of 16011989 in words is "sixteen million, eleven thousand, nine hundred eighty-nine".