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12540537 = 324573049
BaseRepresentation
bin101111110101…
…101001111001
3212121010101100
4233311221321
511202244122
61124442013
7211410222
oct57655171
925533340
1012540537
117095989
124249309
1327a1049
141946249
15117aaac
hexbf5a79

12540537 has 12 divisors (see below), whose sum is σ = 18159700. Its totient is φ = 8339328.

The previous prime is 12540529. The next prime is 12540581. The reversal of 12540537 is 73504521.

It is a happy number.

12540537 is a `hidden beast` number, since 125 + 4 + 0 + 537 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6007401 + 6533136 = 2451^2 + 2556^2 .

It is not a de Polignac number, because 12540537 - 23 = 12540529 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12540537.

It is not an unprimeable number, because it can be changed into a prime (12540937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2589 + ... + 5637.

Almost surely, 212540537 is an apocalyptic number.

It is an amenable number.

12540537 is a deficient number, since it is larger than the sum of its proper divisors (5619163).

12540537 is a wasteful number, since it uses less digits than its factorization.

12540537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3509 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 12540537 is about 3541.2620631634. The cubic root of 12540537 is about 232.3300457579.

The spelling of 12540537 in words is "twelve million, five hundred forty thousand, five hundred thirty-seven".

Divisors: 1 3 9 457 1371 3049 4113 9147 27441 1393393 4180179 12540537