390445 has 16 divisors (see below), whose sum is σ = 529920. Its totient is φ = 273600.

The previous prime is 390437. The next prime is 390449. The reversal of 390445 is 544093.

It is not a de Polignac number, because 390445 - 2³ = 390437 is a prime.

390445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1591 + ... + 1819.

It is an arithmetic number, because the mean of its divisors is an integer number (33120).

2³⁹⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

390445 is a deficient number, since it is larger than the sum of its proper divisors (139475).

390445 is a wasteful number, since it uses less digits than its factorization.

390445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 390445 is about 624.8559834074. The cubic root of 390445 is about 73.0892135021.

The spelling of 390445 in words is "three hundred ninety thousand, four hundred forty-five".