12840225 has 12 divisors (see below), whose sum is σ = 21229296. Its totient is φ = 6848080.

The previous prime is 12840211. The next prime is 12840241. The reversal of 12840225 is 52204821.

12840225 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 12840225 - 2⁵ = 12840193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12840195 and 12840204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85527 + ... + 85676.

It is an arithmetic number, because the mean of its divisors is an integer number (1769108).

Almost surely, 2^12840225 is an apocalyptic number.

12840225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12840225 is a deficient number, since it is larger than the sum of its proper divisors (8389071).

12840225 is a wasteful number, since it uses less digits than its factorization.

12840225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171216 (or 171211 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 12840225 is about 3583.3259689847. The cubic root of 12840225 is about 234.1662015979.

The spelling of 12840225 in words is "twelve million, eight hundred forty thousand, two hundred twenty-five".