390885 has 32 divisors (see below), whose sum is σ = 718848. Its totient is φ = 179520.

The previous prime is 390883. The next prime is 390889. The reversal of 390885 is 588093.

It is not a de Polignac number, because 390885 - 2¹ = 390883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

390885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3744 + ... + 3846.

It is an arithmetic number, because the mean of its divisors is an integer number (22464).

2³⁹⁰⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

390885 is a deficient number, since it is larger than the sum of its proper divisors (327963).

390885 is a wasteful number, since it uses less digits than its factorization.

390885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 390885 is about 625.2079654003. The cubic root of 390885 is about 73.1166584100.

It can be divided in two parts, 39088 and 5, that added together give a palindrome (39093).

The spelling of 390885 in words is "three hundred ninety thousand, eight hundred eighty-five".