391941166 has 8 divisors (see below), whose sum is σ = 588872664. Its totient is φ = 195650280.

The previous prime is 391941163. The next prime is 391941169. The reversal of 391941166 is 661149193.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (391941163) and next prime (391941169).

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 (391941163) 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, 158620 + ... + 161071.

It is an arithmetic number, because the mean of its divisors is an integer number (73609083).

Almost surely, 2^391941166 is an apocalyptic number.

391941166 is a deficient number, since it is larger than the sum of its proper divisors (196931498).

391941166 is a wasteful number, since it uses less digits than its factorization.

391941166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320306.

The product of its digits is 34992, while the sum is 40.

The square root of 391941166 is about 19797.5040345999. The cubic root of 391941166 is about 731.8245259563.

The spelling of 391941166 in words is "three hundred ninety-one million, nine hundred forty-one thousand, one hundred sixty-six".