1375 has 8 divisors (see below), whose sum is σ = 1872.
Its totient is φ = 1000.
The previous prime is 1373. The next prime is 1381. The reversal of 1375 is 5731.
Subtracting 1375 from its reverse (5731), we obtain a square (4356 = 662).
It can be divided in two parts, 13 and 75, that added together give a palindrome (88).
1375 = T10 + T11 + ... +
It is not a de Polignac number, because 1375 - 21 = 1373 is a prime.
It is a Duffinian number.
It is a plaindrome in base 4 and base 16.
It is a nialpdrome in base 5.
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 (1373) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120 + ... + 130.
It is an arithmetic number, because the mean of its divisors is an integer number (234).
1375 is a deficient number, since it is larger than the sum of its proper divisors (497).
1375 is an equidigital number, since it uses as much as digits as its factorization.
1375 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 26 (or 16 counting only the distinct ones).
The product of its digits is 105, while the sum is 16.
The square root of 1375 is about 37.0809924355.
The cubic root of 1375 is about 11.1199004528.
The spelling of 1375 in words is "one thousand, three hundred seventy-five".