390663 has 40 divisors (see below), whose sum is σ = 731808. Its totient is φ = 202176.

The previous prime is 390653. The next prime is 390671. The reversal of 390663 is 366093.

390663 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 390663 - 2⁴ = 390647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

390663 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7345 + ... + 7397.

2³⁹⁰⁶⁶³ is an apocalyptic number.

390663 is a deficient number, since it is larger than the sum of its proper divisors (341145).

390663 is a wasteful number, since it uses less digits than its factorization.

390663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 390663 is about 625.0303992607. The cubic root of 390663 is about 73.1028137822.

It can be divided in two parts, 3906 and 63, that added together give a square (3969 = 63²).

The spelling of 390663 in words is "three hundred ninety thousand, six hundred sixty-three".