385505 has 4 divisors (see below), whose sum is σ = 462612. Its totient is φ = 308400.

The previous prime is 385501. The next prime is 385519. The reversal of 385505 is 505583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505583 = 13 ⋅38891.

It can be written as a sum of positive squares in 2 ways, for example, as 253009 + 132496 = 503^2 + 364^2 .

It is not a de Polignac number, because 385505 - 2² = 385501 is a prime.

It is a super-2 number, since 2×385505² = 297228210050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (385501) 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, 38546 + ... + 38555.

It is an arithmetic number, because the mean of its divisors is an integer number (115653).

2³⁸⁵⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

385505 is a deficient number, since it is larger than the sum of its proper divisors (77107).

385505 is an equidigital number, since it uses as much as digits as its factorization.

385505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77106.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 385505 is about 620.8904895390. The cubic root of 385505 is about 72.7796570983.

The spelling of 385505 in words is "three hundred eighty-five thousand, five hundred five".