390666 has 8 divisors (see below), whose sum is σ = 781344. Its totient is φ = 130220.

The previous prime is 390653. The next prime is 390671. The reversal of 390666 is 666093.

390666 is nontrivially palindromic in base 14.

390666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

390666 is an admirable number.

It is an Ulam number.

390666 is a modest number, since divided by 666 gives 390 as remainder.

It is an unprimeable number.

390666 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, 32550 + ... + 32561.

It is an arithmetic number, because the mean of its divisors is an integer number (97668).

2³⁹⁰⁶⁶⁶ is an apocalyptic number.

390666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390666 is a wasteful number, since it uses less digits than its factorization.

390666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65116.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 390666 is about 625.0327991394. The cubic root of 390666 is about 73.1030009067.

The spelling of 390666 in words is "three hundred ninety thousand, six hundred sixty-six".