390845 has 16 divisors (see below), whose sum is σ = 577920. Its totient is φ = 247104.

The previous prime is 390829. The next prime is 390851. The reversal of 390845 is 548093.

It is not a de Polignac number, because 390845 - 2⁴ = 390829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26 + ... + 884.

It is an arithmetic number, because the mean of its divisors is an integer number (36120).

2³⁹⁰⁸⁴⁵ is an apocalyptic number.

390845 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

390845 is a deficient number, since it is larger than the sum of its proper divisors (187075).

390845 is a wasteful number, since it uses less digits than its factorization.

390845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 390845 is about 625.1759752262. The cubic root of 390845 is about 73.1141642697.

The spelling of 390845 in words is "three hundred ninety thousand, eight hundred forty-five".