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12775945 = 571343653
BaseRepresentation
bin110000101111…
…001000001001
3220001002022011
4300233020021
511232312240
61133455521
7213410440
oct60571011
926032264
1012775945
117236836
1243415a1
132854240
1419a7d57
1511c56ea
hexc2f209

12775945 has 32 divisors (see below), whose sum is σ = 19337472. Its totient is φ = 7886592.

The previous prime is 12775943. The next prime is 12775951. The reversal of 12775945 is 54957721.

It is not a de Polignac number, because 12775945 - 21 = 12775943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12775898 and 12775907.

It is not an unprimeable number, because it can be changed into a prime (12775943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19239 + ... + 19891.

It is an arithmetic number, because the mean of its divisors is an integer number (604296).

It is a vampire number, since it can be written as 27954571 (with its own digits).

Almost surely, 212775945 is an apocalyptic number.

It is an amenable number.

12775945 is a deficient number, since it is larger than the sum of its proper divisors (6561527).

12775945 is a wasteful number, since it uses less digits than its factorization.

12775945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721.

The product of its digits is 88200, while the sum is 40.

The square root of 12775945 is about 3574.3453946142. The cubic root of 12775945 is about 233.7747912356.

The spelling of 12775945 in words is "twelve million, seven hundred seventy-five thousand, nine hundred forty-five".

Divisors: 1 5 7 13 35 43 65 91 215 301 455 559 653 1505 2795 3265 3913 4571 8489 19565 22855 28079 42445 59423 140395 196553 297115 365027 982765 1825135 2555189 12775945