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385780 = 22519289
BaseRepresentation
bin1011110001011110100
3201121012011
41132023310
544321110
612134004
73164503
oct1361364
9647164
10385780
1124392a
12167304
13106795
14a083a
157948a
hex5e2f4

385780 has 12 divisors (see below), whose sum is σ = 810180. Its totient is φ = 154304.

The previous prime is 385771. The next prime is 385783. The reversal of 385780 is 87583.

It can be written as a sum of positive squares in 2 ways, for example, as 204304 + 181476 = 452^2 + 426^2 .

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385783) 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, 9625 + ... + 9664.

It is an arithmetic number, because the mean of its divisors is an integer number (67515).

2385780 is an apocalyptic number.

It is an amenable number.

385780 is an abundant number, since it is smaller than the sum of its proper divisors (424400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

385780 is a wasteful number, since it uses less digits than its factorization.

385780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19298 (or 19296 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 385780 is about 621.1119061812. Note that the first 3 decimals coincide. The cubic root of 385780 is about 72.7969587749.

The spelling of 385780 in words is "three hundred eighty-five thousand, seven hundred eighty".

Divisors: 1 2 4 5 10 20 19289 38578 77156 96445 192890 385780