391255 has 8 divisors (see below), whose sum is σ = 497232. Its totient is φ = 294528.

The previous prime is 391249. The next prime is 391273. The reversal of 391255 is 552193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391255 - 2³ = 391247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2217 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (62154).

2³⁹¹²⁵⁵ is an apocalyptic number.

391255 is a deficient number, since it is larger than the sum of its proper divisors (105977).

391255 is a wasteful number, since it uses less digits than its factorization.

391255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625.

The product of its digits is 1350, while the sum is 25.

The square root of 391255 is about 625.5037969509. The cubic root of 391255 is about 73.1397211456.

It can be divided in two parts, 39125 and 5, that multiplied together give a triangular number (195625 = T₆₂₅).

The spelling of 391255 in words is "three hundred ninety-one thousand, two hundred fifty-five".