Search a number
-
+
1445 = 5172
BaseRepresentation
bin10110100101
31222112
4112211
521240
610405
74133
oct2645
91875
101445
1110a4
12a05
13872
14753
15665
hex5a5

1445 has 6 divisors (see below), whose sum is σ = 1842. Its totient is φ = 1088.

The previous prime is 1439. The next prime is 1447. The reversal of 1445 is 5441.

Subtracting from 1445 its sum of digits (14), we obtain a triangular number (1431 = T53).

Multipling 1445 by its product of digits (80), we get a square (115600 = 3402).

Adding to 1445 its reverse (5441), we get a palindrome (6886).

It can be divided in two parts, 14 and 45, that multiplied together give a triangular number (630 = T35).

1445 is nontrivially palindromic in base 4 and base 16.

It is a Cunningham number, because it is equal to 382+1.

It can be written as a sum of positive squares in 3 ways, for example, as 484 + 961 = 22^2 + 31^2 .

It is not a de Polignac number, because 1445 - 24 = 1429 is a prime.

It is a Duffinian number.

1445 is an undulating number in base 16.

It is a plaindrome in base 10.

It is a nialpdrome in base 13, base 14 and base 15.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77 + ... + 93.

It is an arithmetic number, because the mean of its divisors is an integer number (307).

It is an amenable number.

1445 is a deficient number, since it is larger than the sum of its proper divisors (397).

1445 is an equidigital number, since it uses as much as digits as its factorization.

1445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39 (or 22 counting only the distinct ones).

The product of its digits is 80, while the sum is 14.

The square root of 1445 is about 38.0131556175. The cubic root of 1445 is about 11.3054871933.

The spelling of 1445 in words is "one thousand, four hundred forty-five".

Divisors: 1 5 17 85 289 1445