385891 has 4 divisors (see below), whose sum is σ = 420984. Its totient is φ = 350800.

The previous prime is 385877. The next prime is 385897. The reversal of 385891 is 198583.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 385891 - 2⁵ = 385859 is a prime.

It is a Duffinian number.

385891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (385897) 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, 17530 + ... + 17551.

It is an arithmetic number, because the mean of its divisors is an integer number (105246).

2³⁸⁵⁸⁹¹ is an apocalyptic number.

385891 is a deficient number, since it is larger than the sum of its proper divisors (35093).

385891 is a wasteful number, since it uses less digits than its factorization.

385891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35092.

The product of its digits is 8640, while the sum is 34.

The square root of 385891 is about 621.2012556330. The cubic root of 385891 is about 72.8039400315.

It can be divided in two parts, 38 and 5891, that added together give a square (5929 = 77²).

The spelling of 385891 in words is "three hundred eighty-five thousand, eight hundred ninety-one".