16439 has 4 divisors (see below), whose sum is σ = 17424. Its totient is φ = 15456.

The previous prime is 16433. The next prime is 16447. The reversal of 16439 is 93461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93461 = 19 ⋅4919.

It is a cyclic number.

It is not a de Polignac number, because 16439 - 2⁸ = 16183 is a prime.

It is a d-powerful number, because it can be written as 1 + 6² + 4⁷ + 3² + 9 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467 + ... + 500.

It is an arithmetic number, because the mean of its divisors is an integer number (4356).

2¹⁶⁴³⁹ is an apocalyptic number.

16439 is a deficient number, since it is larger than the sum of its proper divisors (985).

16439 is an equidigital number, since it uses as much as digits as its factorization.

16439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984.

The product of its digits is 648, while the sum is 23.

The square root of 16439 is about 128.2146637480. The cubic root of 16439 is about 25.4268053552.

The spelling of 16439 in words is "sixteen thousand, four hundred thirty-nine".