391366 has 8 divisors (see below), whose sum is σ = 594720. Its totient is φ = 193128.

The previous prime is 391351. The next prime is 391367. The reversal of 391366 is 663193.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081 + ... + 1396.

It is an arithmetic number, because the mean of its divisors is an integer number (74340).

2³⁹¹³⁶⁶ is an apocalyptic number.

391366 is a deficient number, since it is larger than the sum of its proper divisors (203354).

391366 is a wasteful number, since it uses less digits than its factorization.

391366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558.

The product of its digits is 2916, while the sum is 28.

The square root of 391366 is about 625.5925191369. The cubic root of 391366 is about 73.1466371308.

It can be divided in two parts, 391 and 366, that added together give a palindrome (757).

The spelling of 391366 in words is "three hundred ninety-one thousand, three hundred sixty-six".