385643 has 4 divisors (see below), whose sum is σ = 405960. Its totient is φ = 365328.

The previous prime is 385639. The next prime is 385657. The reversal of 385643 is 346583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346583 = 127 ⋅2729.

It is a cyclic number.

It is not a de Polignac number, because 385643 - 2² = 385639 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 (385663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10130 + ... + 10167.

It is an arithmetic number, because the mean of its divisors is an integer number (101490).

2³⁸⁵⁶⁴³ is an apocalyptic number.

385643 is a deficient number, since it is larger than the sum of its proper divisors (20317).

385643 is a wasteful number, since it uses less digits than its factorization.

385643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20316.

The product of its digits is 8640, while the sum is 29.

The square root of 385643 is about 621.0016103039. The cubic root of 385643 is about 72.7883404223.

Subtracting from 385643 its reverse (346583), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 385643 in words is "three hundred eighty-five thousand, six hundred forty-three".