1995 has 16 divisors (see below), whose sum is σ = 3840.
Its totient is φ = 864.
The previous prime is 1993. The next prime is 1997. The reversal of 1995 is 5991.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (1993) and next prime (1997).
It is not a de Polignac number, because 1995 - 21 = 1993 is a prime.
1995 is a lucky number.
It is a nialpdrome in base 7 and base 13.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1993) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96 + ... + 114.
It is an arithmetic number, because the mean of its divisors is an integer number (240).
1995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
1995 is a deficient number, since it is larger than the sum of its proper divisors (1845).
1995 is a wasteful number, since it uses less digits than its factorization.
1995 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 34.
The product of its digits is 405, while the sum is 24.
The square root of 1995 is about 44.6654228683.
The cubic root of 1995 is about 12.5887023952.
The spelling of 1995 in words is "one thousand, nine hundred ninety-five".