391055 has 8 divisors (see below), whose sum is σ = 536352. Its totient is φ = 268128.

The previous prime is 391049. The next prime is 391057. The reversal of 391055 is 550193.

391055 = T₃₉₃ + T₃₉₄ + ... + T₃₉₇.

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

It is not a de Polignac number, because 391055 - 2⁶ = 390991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5552 + ... + 5621.

It is an arithmetic number, because the mean of its divisors is an integer number (67044).

2³⁹¹⁰⁵⁵ is an apocalyptic number.

391055 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

391055 is a deficient number, since it is larger than the sum of its proper divisors (145297).

391055 is a wasteful number, since it uses less digits than its factorization.

391055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11185.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 391055 is about 625.3439053833. The cubic root of 391055 is about 73.1272566085.

The spelling of 391055 in words is "three hundred ninety-one thousand, fifty-five".