391995 has 24 divisors (see below), whose sum is σ = 703872. Its totient is φ = 201600.

The previous prime is 391987. The next prime is 391999. The reversal of 391995 is 599193.

It is not a de Polignac number, because 391995 - 2³ = 391987 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1255 + ... + 1535.

It is an arithmetic number, because the mean of its divisors is an integer number (29328).

2³⁹¹⁹⁹⁵ is an apocalyptic number.

391995 is a deficient number, since it is larger than the sum of its proper divisors (311877).

391995 is a wasteful number, since it uses less digits than its factorization.

391995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 320 counting only the distinct ones).

The product of its digits is 10935, while the sum is 36.

The square root of 391995 is about 626.0950407087. The cubic root of 391995 is about 73.1858030337.

It can be divided in two parts, 39199 and 5, that added together give a square (39204 = 198²).

The spelling of 391995 in words is "three hundred ninety-one thousand, nine hundred ninety-five".