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128238 = 23112967
BaseRepresentation
bin11111010011101110
320111220120
4133103232
513100423
62425410
71042605
oct372356
9214816
10128238
1188390
1262266
13464a6
1434a3c
1527ee3
hex1f4ee

128238 has 32 divisors (see below), whose sum is σ = 293760. Its totient is φ = 36960.

The previous prime is 128237. The next prime is 128239. The reversal of 128238 is 832821.

It is an interprime number because it is at equal distance from previous prime (128237) and next prime (128239).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128237) 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, 1881 + ... + 1947.

It is an arithmetic number, because the mean of its divisors is an integer number (9180).

2128238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146880).

128238 is an abundant number, since it is smaller than the sum of its proper divisors (165522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128238 is a wasteful number, since it uses less digits than its factorization.

128238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112.

The product of its digits is 768, while the sum is 24.

The square root of 128238 is about 358.1033370411. The cubic root of 128238 is about 50.4280581989.

The spelling of 128238 in words is "one hundred twenty-eight thousand, two hundred thirty-eight".

Divisors: 1 2 3 6 11 22 29 33 58 66 67 87 134 174 201 319 402 638 737 957 1474 1914 1943 2211 3886 4422 5829 11658 21373 42746 64119 128238