128719 has 4 divisors (see below), whose sum is σ = 130144. Its totient is φ = 127296.

The previous prime is 128717. The next prime is 128747. The reversal of 128719 is 917821.

128719 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 917821 = 29 ⋅31649.

It is a cyclic number.

It is not a de Polignac number, because 128719 - 2¹ = 128717 is a prime.

It is a super-2 number, since 2×128719² = 33137161922, which contains 22 as substring.

It is a Duffinian number.

128719 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128717) 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 3 ways as a sum of consecutive naturals, for example, 567 + ... + 760.

It is an arithmetic number, because the mean of its divisors is an integer number (32536).

2¹²⁸⁷¹⁹ is an apocalyptic number.

128719 is a deficient number, since it is larger than the sum of its proper divisors (1425).

128719 is an equidigital number, since it uses as much as digits as its factorization.

128719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its digits is 1008, while the sum is 28.

The square root of 128719 is about 358.7743023127. The cubic root of 128719 is about 50.4910286975.

It can be divided in two parts, 12871 and 9, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 128719 in words is "one hundred twenty-eight thousand, seven hundred nineteen".