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19189 = 31619
BaseRepresentation
bin100101011110101
3222022201
410223311
51103224
6224501
7106642
oct45365
928281
1019189
1113465
12b131
138971
146dc9
155a44
hex4af5

19189 has 4 divisors (see below), whose sum is σ = 19840. Its totient is φ = 18540.

The previous prime is 19183. The next prime is 19207. The reversal of 19189 is 98191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98191 = 149659.

It is a cyclic number.

It is not a de Polignac number, because 19189 - 23 = 19181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279 + ... + 340.

It is an arithmetic number, because the mean of its divisors is an integer number (4960).

219189 is an apocalyptic number.

It is an amenable number.

19189 is a deficient number, since it is larger than the sum of its proper divisors (651).

19189 is an equidigital number, since it uses as much as digits as its factorization.

19189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650.

The product of its digits is 648, while the sum is 28.

The square root of 19189 is about 138.5243660877. The cubic root of 19189 is about 26.7722033025.

The spelling of 19189 in words is "nineteen thousand, one hundred eighty-nine".

Divisors: 1 31 619 19189