390866 has 8 divisors (see below), whose sum is σ = 670080. Its totient is φ = 167508.

The previous prime is 390851. The next prime is 390869. The reversal of 390866 is 668093.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390869) by changing a digit.

390866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13946 + ... + 13973.

It is an arithmetic number, because the mean of its divisors is an integer number (83760).

2³⁹⁰⁸⁶⁶ is an apocalyptic number.

390866 is a deficient number, since it is larger than the sum of its proper divisors (279214).

390866 is a wasteful number, since it uses less digits than its factorization.

390866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27928.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 390866 is about 625.1927702717. The cubic root of 390866 is about 73.1154737146.

The spelling of 390866 in words is "three hundred ninety thousand, eight hundred sixty-six".