12840825 has 24 divisors (see below), whose sum is σ = 21336928. Its totient is φ = 6814080.

The previous prime is 12840811. The next prime is 12840833. The reversal of 12840825 is 52804821.

It is not a de Polignac number, because 12840825 - 2⁶ = 12840761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12840792 and 12840801.

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, 23202 + ... + 23748.

Almost surely, 2^12840825 is an apocalyptic number.

12840825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12840825 is a deficient number, since it is larger than the sum of its proper divisors (8496103).

12840825 is a wasteful number, since it uses less digits than its factorization.

12840825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 12840825 is about 3583.4096891090. The cubic root of 12840825 is about 234.1698489258.

The spelling of 12840825 in words is "twelve million, eight hundred forty thousand, eight hundred twenty-five".