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BaseRepresentation
bin11111011101101111
320112210022
4133131233
513111004
62432355
71044512
oct373557
9215708
10128879
1188913
12626bb
134687a
1434d79
15282be
hex1f76f

128879 has 2 divisors, whose sum is σ = 128880. Its totient is φ = 128878.

The previous prime is 128873. The next prime is 128903. The reversal of 128879 is 978821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (978821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128879 - 212 = 124783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64439 + 64440.

It is an arithmetic number, because the mean of its divisors is an integer number (64440).

2128879 is an apocalyptic number.

128879 is a deficient number, since it is larger than the sum of its proper divisors (1).

128879 is an equidigital number, since it uses as much as digits as its factorization.

128879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 128879 is about 358.9972144739. The cubic root of 128879 is about 50.5119404501.

The spelling of 128879 in words is "one hundred twenty-eight thousand, eight hundred seventy-nine".