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6381945 = 325373833
BaseRepresentation
bin11000010110000101111001
3110000020101100
4120112011321
53113210240
6344442013
7105150153
oct30260571
913006340
106381945
113669939
122179309
131425acb
14bc1ad3
15860e30
hex616179

6381945 has 24 divisors (see below), whose sum is σ = 11363976. Its totient is φ = 3310848.

The previous prime is 6381941. The next prime is 6381961. The reversal of 6381945 is 5491836.

6381945 is a `hidden beast` number, since 638 + 19 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 962361 + 5419584 = 981^2 + 2328^2 .

It is not a de Polignac number, because 6381945 - 22 = 6381941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6381941) 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 23 ways as a sum of consecutive naturals, for example, 252 + ... + 3581.

It is an arithmetic number, because the mean of its divisors is an integer number (473499).

Almost surely, 26381945 is an apocalyptic number.

It is an amenable number.

6381945 is a deficient number, since it is larger than the sum of its proper divisors (4982031).

6381945 is a wasteful number, since it uses less digits than its factorization.

6381945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881 (or 3878 counting only the distinct ones).

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

The square root of 6381945 is about 2526.2511751605. The cubic root of 6381945 is about 185.4887974771.

The spelling of 6381945 in words is "six million, three hundred eighty-one thousand, nine hundred forty-five".

Divisors: 1 3 5 9 15 37 45 111 185 333 555 1665 3833 11499 19165 34497 57495 141821 172485 425463 709105 1276389 2127315 6381945