390945 has 16 divisors (see below), whose sum is σ = 636480. Its totient is φ = 204864.

The previous prime is 390893. The next prime is 390953. The reversal of 390945 is 549093.

It is not a de Polignac number, because 390945 - 2⁹ = 390433 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 811 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (39780).

2³⁹⁰⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

390945 is a deficient number, since it is larger than the sum of its proper divisors (245535).

390945 is a wasteful number, since it uses less digits than its factorization.

390945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 390945 is about 625.2559475927. The cubic root of 390945 is about 73.1203993015.

The spelling of 390945 in words is "three hundred ninety thousand, nine hundred forty-five".