128629 has 2 divisors, whose sum is σ = 128630. Its totient is φ = 128628.
The previous prime is 128621. The next prime is 128657. The reversal of 128629 is 926821.
It is a happy number.
It is an a-pointer prime, because the next prime (128657) can be obtained adding 128629 to its sum of digits (28).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 119025 + 9604 = 345^2 + 98^2 .
It is a cyclic number.
It is not a de Polignac number, because 128629 - 23 = 128621 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 128597 and 128606.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (128621) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64314 + 64315.
It is an arithmetic number, because the mean of its divisors is an integer number (64315).
2128629 is an apocalyptic number.
It is an amenable number.
128629 is a deficient number, since it is larger than the sum of its proper divisors (1).
128629 is an equidigital number, since it uses as much as digits as its factorization.
128629 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1728, while the sum is 28.
The square root of 128629 is about 358.6488533371. The cubic root of 128629 is about 50.4792582205.
It can be divided in two parts, 128 and 629, that added together give a palindrome (757).
The spelling of 128629 in words is "one hundred twenty-eight thousand, six hundred twenty-nine".
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