385691 has 4 divisors (see below), whose sum is σ = 387000. Its totient is φ = 384384.

The previous prime is 385663. The next prime is 385709. The reversal of 385691 is 196583.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 385691 - 2¹⁸ = 123547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385621) 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, 20 + ... + 878.

It is an arithmetic number, because the mean of its divisors is an integer number (96750).

2³⁸⁵⁶⁹¹ is an apocalyptic number.

385691 is a deficient number, since it is larger than the sum of its proper divisors (1309).

385691 is an equidigital number, since it uses as much as digits as its factorization.

385691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its digits is 6480, while the sum is 32.

The square root of 385691 is about 621.0402563441. The cubic root of 385691 is about 72.7913602233.

The spelling of 385691 in words is "three hundred eighty-five thousand, six hundred ninety-one".