395 has 4 divisors (see below), whose sum is σ = 480.
Its totient is φ = 312.
The previous prime is 389. The next prime is 397. The reversal of 395 is 593.
Subtracting from 395 its sum of digits (17), we obtain a triangular number (378 = T27).
It can be divided in two parts, 39 and 5, that added together give a palindrome (44).
395 = T10 + T11 + ... +
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 395 - 24 = 379 is a prime.
It is a plaindrome in base 6, base 9, base 12, base 13 and base 16.
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 395.
It is not an unprimeable number, because it can be changed into a prime (397) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 44.
It is an arithmetic number, because the mean of its divisors is an integer number (120).
395 is a deficient number, since it is larger than the sum of its proper divisors (85).
395 is an equidigital number, since it uses as much as digits as its factorization.
395 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 84.
The product of its digits is 135, while the sum is 17.
The square root of 395 is about 19.8746069144.
The cubic root of 395 is about 7.3372339212.
The spelling of 395 in words is "three hundred ninety-five", and thus it is an aban number and an oban number.