12840705 has 24 divisors (see below), whose sum is σ = 22576320. Its totient is φ = 6750240.

The previous prime is 12840697. The next prime is 12840743. The reversal of 12840705 is 50704821.

12840705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12840705 - 2³ = 12840697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1186 + ... + 5204.

It is an arithmetic number, because the mean of its divisors is an integer number (940680).

Almost surely, 2^12840705 is an apocalyptic number.

12840705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12840705 is a deficient number, since it is larger than the sum of its proper divisors (9735615).

12840705 is a wasteful number, since it uses less digits than its factorization.

12840705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 12840705 is about 3583.3929452406. The cubic root of 12840705 is about 234.1691194693.

The spelling of 12840705 in words is "twelve million, eight hundred forty thousand, seven hundred five".