390785 has 4 divisors (see below), whose sum is σ = 468948. Its totient is φ = 312624.

The previous prime is 390781. The next prime is 390791. The reversal of 390785 is 587093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587093 = 13 ⋅45161.

It can be written as a sum of positive squares in 2 ways, for example, as 49729 + 341056 = 223^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 390785 - 2² = 390781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39074 + ... + 39083.

It is an arithmetic number, because the mean of its divisors is an integer number (117237).

2³⁹⁰⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

390785 is a deficient number, since it is larger than the sum of its proper divisors (78163).

390785 is an equidigital number, since it uses as much as digits as its factorization.

390785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78162.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 390785 is about 625.1279868955. The cubic root of 390785 is about 73.1104227402.

The spelling of 390785 in words is "three hundred ninety thousand, seven hundred eighty-five".