385813 has 4 divisors (see below), whose sum is σ = 387468. Its totient is φ = 384160.

The previous prime is 385811. The next prime is 385817. The reversal of 385813 is 318583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318583 = 53 ⋅6011.

It can be written as a sum of positive squares in 2 ways, for example, as 338724 + 47089 = 582^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 385813 - 2¹ = 385811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385811) 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, 406 + ... + 967.

It is an arithmetic number, because the mean of its divisors is an integer number (96867).

2³⁸⁵⁸¹³ is an apocalyptic number.

It is an amenable number.

385813 is a deficient number, since it is larger than the sum of its proper divisors (1655).

385813 is a wasteful number, since it uses less digits than its factorization.

385813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654.

The product of its digits is 2880, while the sum is 28.

The square root of 385813 is about 621.1384708742. The cubic root of 385813 is about 72.7990344235.

The spelling of 385813 in words is "three hundred eighty-five thousand, eight hundred thirteen".