12840945 has 16 divisors (see below), whose sum is σ = 22126272. Its totient is φ = 6321600.

The previous prime is 12840943. The next prime is 12840953. The reversal of 12840945 is 54904821.

It is not a de Polignac number, because 12840945 - 2¹ = 12840943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12840943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32731 + ... + 33120.

It is an arithmetic number, because the mean of its divisors is an integer number (1382892).

Almost surely, 2^12840945 is an apocalyptic number.

12840945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12840945 is a deficient number, since it is larger than the sum of its proper divisors (9285327).

12840945 is a wasteful number, since it uses less digits than its factorization.

12840945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65872.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 12840945 is about 3583.4264328991. The cubic root of 12840945 is about 234.1705783777.

The spelling of 12840945 in words is "twelve million, eight hundred forty thousand, nine hundred forty-five".