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12661985 = 571093319
BaseRepresentation
bin110000010011…
…010011100001
3212211021222102
4300103103201
511220140420
61131220145
7212424260
oct60232341
925737872
1012661985
117169156
1242a7655
1328143cb
1419785d7
1511a1a75
hexc134e1

12661985 has 16 divisors (see below), whose sum is σ = 17529600. Its totient is φ = 8600256.

The previous prime is 12661973. The next prime is 12661997. The reversal of 12661985 is 58916621.

It is an interprime number because it is at equal distance from previous prime (12661973) and next prime (12661997).

It is not a de Polignac number, because 12661985 - 210 = 12660961 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2156 + ... + 5474.

It is an arithmetic number, because the mean of its divisors is an integer number (1095600).

Almost surely, 212661985 is an apocalyptic number.

It is an amenable number.

12661985 is a deficient number, since it is larger than the sum of its proper divisors (4867615).

12661985 is a wasteful number, since it uses less digits than its factorization.

12661985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440.

The product of its digits is 25920, while the sum is 38.

The square root of 12661985 is about 3558.3683058391. The cubic root of 12661985 is about 233.0776325885.

The spelling of 12661985 in words is "twelve million, six hundred sixty-one thousand, nine hundred eighty-five".

Divisors: 1 5 7 35 109 545 763 3319 3815 16595 23233 116165 361771 1808855 2532397 12661985