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128319 = 342773
BaseRepresentation
bin11111010100111111
320112000120
4133110333
513101234
62430023
71043052
oct372477
9215016
10128319
1188454
1262313
1346539
1434a99
1528049
hex1f53f

128319 has 4 divisors (see below), whose sum is σ = 171096. Its totient is φ = 85544.

The previous prime is 128311. The next prime is 128321. The reversal of 128319 is 913821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128319 - 23 = 128311 is a prime.

It is a super-2 number, since 2×1283192 = 32931531522, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21384 + ... + 21389.

It is an arithmetic number, because the mean of its divisors is an integer number (42774).

2128319 is an apocalyptic number.

128319 is a deficient number, since it is larger than the sum of its proper divisors (42777).

128319 is an equidigital number, since it uses as much as digits as its factorization.

128319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42776.

The product of its digits is 432, while the sum is 24.

The square root of 128319 is about 358.2164150343. The cubic root of 128319 is about 50.4386733910.

The spelling of 128319 in words is "one hundred twenty-eight thousand, three hundred nineteen".

Divisors: 1 3 42773 128319