495 can be written using four 4's:
See also 113
495 has 12
divisors (see below), whose sum is σ = 936
Its totient is φ = 240
The previous prime is 491. The next prime is 499. The reversal of 495 is 594.
Added to its reverse (594) it gives a square (1089 = 332).
495 is nontrivially palindromic in base 2, base 8 and base 12.
495 is a nontrivial binomial coefficient, being equal to C(12, 4).
It is an interprime number because it is at equal distance from previous prime (491) and next prime (499).
It is not a de Polignac number, because 495 - 22 = 491 is a prime.
495 is an undulating number in base 8 and base 12.
495 is a lucky number.
It is a plaindrome in base 16.
It is a nialpdrome in base 9 and base 11.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (491) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40 + ... + 50.
It is an arithmetic number, because the mean of its divisors is an integer number (78).
495 is a gapful number since it is divisible by the number (45) formed by its first and last digit.
495 is a deficient number, since it is larger than the sum of its proper divisors (441).
495 is a wasteful number, since it uses less digits than its factorization.
495 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 22 (or 19 counting only the distinct ones).
The product of its digits is 180, while the sum is 18.
The square root of 495 is about 22.2485954613.
The cubic root of 495 is about 7.9104598935.
Adding to 495 its reverse (594), we get a square (1089 = 332).
Subtracting 495 from its reverse (594), we obtain a palindrome (99).
It can be divided in two parts, 4 and 95, that added together give a palindrome (99).
The spelling of 495 in words is "four hundred ninety-five", and thus it is an aban number.