390660 has 48 divisors (see below), whose sum is σ = 1161216. Its totient is φ = 97792.

The previous prime is 390653. The next prime is 390671. The reversal of 390660 is 66093.

It is a self number, because there is not a number n which added to its sum of digits gives 390660.

It is a congruent number.

It is an unprimeable number.

390660 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 15 ways as a sum of consecutive naturals, for example, 829 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2³⁹⁰⁶⁶⁰ is an apocalyptic number.

390660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580608).

390660 is an abundant number, since it is smaller than the sum of its proper divisors (770556).

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

390660 is a wasteful number, since it uses less digits than its factorization.

390660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 390660 is about 625.0279993728. The cubic root of 390660 is about 73.1026266567.

The spelling of 390660 in words is "three hundred ninety thousand, six hundred sixty".