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389385 = 32517509
BaseRepresentation
bin1011111000100001001
3201210010200
41133010021
544430020
612202413
73211143
oct1370411
9653120
10389385
11246607
12169409
13108309
14a1c93
157a590
hex5f109

389385 has 24 divisors (see below), whose sum is σ = 716040. Its totient is φ = 195072.

The previous prime is 389381. The next prime is 389399. The reversal of 389385 is 583983.

It can be written as a sum of positive squares in 4 ways, for example, as 138384 + 251001 = 372^2 + 501^2 .

It is not a de Polignac number, because 389385 - 22 = 389381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (389381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 511 + ... + 1019.

It is an arithmetic number, because the mean of its divisors is an integer number (29835).

389385 is a Friedman number, since it can be written as 85*9*(8^3-3), using all its digits and the basic arithmetic operations.

2389385 is an apocalyptic number.

It is an amenable number.

389385 is a deficient number, since it is larger than the sum of its proper divisors (326655).

389385 is a wasteful number, since it uses less digits than its factorization.

389385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 534 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 389385 is about 624.0072114968. The cubic root of 389385 is about 73.0230114481.

The spelling of 389385 in words is "three hundred eighty-nine thousand, three hundred eighty-five".

Divisors: 1 3 5 9 15 17 45 51 85 153 255 509 765 1527 2545 4581 7635 8653 22905 25959 43265 77877 129795 389385