391166 has 8 divisors (see below), whose sum is σ = 591624. Its totient is φ = 193960.

The previous prime is 391163. The next prime is 391177. The reversal of 391166 is 661193.

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 (391163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 1008.

It is an arithmetic number, because the mean of its divisors is an integer number (73953).

2³⁹¹¹⁶⁶ is an apocalyptic number.

391166 is a deficient number, since it is larger than the sum of its proper divisors (200458).

391166 is a wasteful number, since it uses less digits than its factorization.

391166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626.

The product of its digits is 972, while the sum is 26.

The square root of 391166 is about 625.4326502510. The cubic root of 391166 is about 73.1341749512.

The spelling of 391166 in words is "three hundred ninety-one thousand, one hundred sixty-six".