390555 has 32 divisors (see below), whose sum is σ = 760320. Its totient is φ = 188640.

The previous prime is 390553. The next prime is 390581. The reversal of 390555 is 555093.

It is not a de Polignac number, because 390555 - 2¹ = 390553 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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

390555 is a modest number, since divided by 555 gives 390 as remainder.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (390553) 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, 1354 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (23760).

390555 is a Friedman number, since it can be written as (5^9-350)/5, using all its digits and the basic arithmetic operations.

2³⁹⁰⁵⁵⁵ is an apocalyptic number.

390555 is a deficient number, since it is larger than the sum of its proper divisors (369765).

390555 is a wasteful number, since it uses less digits than its factorization.

390555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 3375, while the sum is 27.

The square root of 390555 is about 624.9439974910. The cubic root of 390555 is about 73.0960766613.

It can be divided in two parts, 39055 and 5, that added together give a triangular number (39060 = T₂₇₉).

The spelling of 390555 in words is "three hundred ninety thousand, five hundred fifty-five".