128873 has 2 divisors, whose sum is σ = 128874. Its totient is φ = 128872.
The previous prime is 128861. The next prime is 128879. The reversal of 128873 is 378821.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 120409 + 8464 = 347^2 + 92^2 .
It is an emirp because it is prime and its reverse (378821) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 128873 - 24 = 128857 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (128879) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64436 + 64437.
It is an arithmetic number, because the mean of its divisors is an integer number (64437).
2128873 is an apocalyptic number.
It is an amenable number.
128873 is a deficient number, since it is larger than the sum of its proper divisors (1).
128873 is an equidigital number, since it uses as much as digits as its factorization.
128873 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2688, while the sum is 29.
The square root of 128873 is about 358.9888577658. The cubic root of 128873 is about 50.5111565718.
It can be divided in two parts, 128 and 873, that added together give a palindrome (1001).
The spelling of 128873 in words is "one hundred twenty-eight thousand, eight hundred seventy-three".
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