385921 has 4 divisors (see below), whose sum is σ = 389844. Its totient is φ = 382000.

The previous prime is 385907. The next prime is 385927. The reversal of 385921 is 129583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129583 = 101 ⋅1283.

It can be written as a sum of positive squares in 2 ways, for example, as 360000 + 25921 = 600^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 385921 - 2⁷ = 385793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 385921.

It is not an unprimeable number, because it can be changed into a prime (385927) 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, 1810 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (97461).

2³⁸⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

385921 is a deficient number, since it is larger than the sum of its proper divisors (3923).

385921 is a wasteful number, since it uses less digits than its factorization.

385921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922.

The product of its digits is 2160, while the sum is 28.

The square root of 385921 is about 621.2254019275. The cubic root of 385921 is about 72.8058266278.

The spelling of 385921 in words is "three hundred eighty-five thousand, nine hundred twenty-one".