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BaseRepresentation
bin10101101001
31220022
4111221
521020
610225
74016
oct2551
91808
101385
11104a
12975
13827
1470d
15625
hex569

1385 has 4 divisors (see below), whose sum is σ = 1668. Its totient is φ = 1104.

The previous prime is 1381. The next prime is 1399. The reversal of 1385 is 5831.

1385 = T21 + T22 + ... + T25.

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

It can be written as a sum of positive squares in 2 ways, for example, as 361 + 1024 = 19^2 + 32^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385 - 22 = 1381 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1381) 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, 134 + ... + 143.

It is an arithmetic number, because the mean of its divisors is an integer number (417).

It is an amenable number.

1385 is a deficient number, since it is larger than the sum of its proper divisors (283).

1385 is an equidigital number, since it uses as much as digits as its factorization.

1385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282.

The product of its digits is 120, while the sum is 17.

The square root of 1385 is about 37.2155881319. The cubic root of 1385 is about 11.1467926989.

The spelling of 1385 in words is "one thousand, three hundred eighty-five".

Divisors: 1 5 277 1385