Search a number
-
+
19445 = 53889
BaseRepresentation
bin100101111110101
3222200012
410233311
51110240
6230005
7110456
oct45765
928605
1019445
1113678
12b305
138b0a
14712d
155b65
hex4bf5

19445 has 4 divisors (see below), whose sum is σ = 23340. Its totient is φ = 15552.

The previous prime is 19441. The next prime is 19447. The reversal of 19445 is 54491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54491 = 291879.

It can be written as a sum of positive squares in 2 ways, for example, as 10609 + 8836 = 103^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 19445 - 22 = 19441 is a prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 19445.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 19445.

It is not an unprimeable number, because it can be changed into a prime (19441) 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, 1940 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (5835).

219445 is an apocalyptic number.

It is an amenable number.

19445 is a deficient number, since it is larger than the sum of its proper divisors (3895).

19445 is an equidigital number, since it uses as much as digits as its factorization.

19445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894.

The product of its digits is 720, while the sum is 23.

The square root of 19445 is about 139.4453297891. The cubic root of 19445 is about 26.8907335311.

It can be divided in two parts, 19 and 445, that added together give a palindrome (464).

The spelling of 19445 in words is "nineteen thousand, four hundred forty-five".

Divisors: 1 5 3889 19445