385405 has 4 divisors (see below), whose sum is σ = 462492. Its totient is φ = 308320.

The previous prime is 385403. The next prime is 385417. The reversal of 385405 is 504583.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504583 = 19 ⋅26557.

It can be written as a sum of positive squares in 2 ways, for example, as 174724 + 210681 = 418^2 + 459^2 .

It is not a de Polignac number, because 385405 - 2¹ = 385403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 385405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385403) 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, 38536 + ... + 38545.

It is an arithmetic number, because the mean of its divisors is an integer number (115623).

2³⁸⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

385405 is a deficient number, since it is larger than the sum of its proper divisors (77087).

385405 is an equidigital number, since it uses as much as digits as its factorization.

385405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77086.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 385405 is about 620.8099548171. The cubic root of 385405 is about 72.7733635395.

Adding to 385405 its reverse (504583), we get a palindrome (889988).

The spelling of 385405 in words is "three hundred eighty-five thousand, four hundred five".