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128169 = 3347101
BaseRepresentation
bin11111010010101001
320111211000
4133102221
513100134
62425213
71042446
oct372251
9214730
10128169
1188328
1262209
1346452
14349cd
1527e99
hex1f4a9

128169 has 16 divisors (see below), whose sum is σ = 195840. Its totient is φ = 82800.

The previous prime is 128159. The next prime is 128173. The reversal of 128169 is 961821.

It is not a de Polignac number, because 128169 - 24 = 128153 is a prime.

It is a super-2 number, since 2×1281692 = 32854585122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (128119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1219 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (12240).

2128169 is an apocalyptic number.

It is an amenable number.

128169 is a deficient number, since it is larger than the sum of its proper divisors (67671).

128169 is a wasteful number, since it uses less digits than its factorization.

128169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 151 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 128169 is about 358.0069831721. The cubic root of 128169 is about 50.4190121016.

The spelling of 128169 in words is "one hundred twenty-eight thousand, one hundred sixty-nine".

Divisors: 1 3 9 27 47 101 141 303 423 909 1269 2727 4747 14241 42723 128169