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12805138 = 252112289
BaseRepresentation
bin110000110110…
…010000010010
3220002120100101
4300312100102
511234231023
61134243014
7213561523
oct60662022
926076311
1012805138
117256765
12435646a
132864608
1419b484a
1511ce1ad
hexc36412

12805138 has 8 divisors (see below), whose sum is σ = 19246140. Its totient is φ = 6389760.

The previous prime is 12805129. The next prime is 12805141. The reversal of 12805138 is 83150821.

It can be written as a sum of positive squares in 2 ways, for example, as 12766329 + 38809 = 3573^2 + 197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5103 + ... + 7186.

Almost surely, 212805138 is an apocalyptic number.

12805138 is a deficient number, since it is larger than the sum of its proper divisors (6441002).

12805138 is a wasteful number, since it uses less digits than its factorization.

12805138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12812.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 12805138 is about 3578.4267492852. The cubic root of 12805138 is about 233.9527140433.

Adding to 12805138 its reverse (83150821), we get a palindrome (95955959).

The spelling of 12805138 in words is "twelve million, eight hundred five thousand, one hundred thirty-eight".

Divisors: 1 2 521 1042 12289 24578 6402569 12805138