128726 has 8 divisors (see below), whose sum is σ = 207984. Its totient is φ = 59400.

The previous prime is 128717. The next prime is 128747. The reversal of 128726 is 627821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 4951 = 128726 / (1 + 2 + 8 + 7 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 128695 and 128704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2450 + ... + 2501.

It is an arithmetic number, because the mean of its divisors is an integer number (25998).

2¹²⁸⁷²⁶ is an apocalyptic number.

128726 is a deficient number, since it is larger than the sum of its proper divisors (79258).

128726 is a wasteful number, since it uses less digits than its factorization.

128726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966.

The product of its digits is 1344, while the sum is 26.

The square root of 128726 is about 358.7840576168. The cubic root of 128726 is about 50.4919439490.

The spelling of 128726 in words is "one hundred twenty-eight thousand, seven hundred twenty-six".