12840445 has 8 divisors (see below), whose sum is σ = 15767136. Its totient is φ = 10033296.

The previous prime is 12840427. The next prime is 12840461. The reversal of 12840445 is 54404821.

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

It is a cyclic number.

It is not a de Polignac number, because 12840445 - 2⁹ = 12839933 is a prime.

It is a super-3 number, since 3×12840445³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29647 + ... + 30076.

It is an arithmetic number, because the mean of its divisors is an integer number (1970892).

Almost surely, 2^12840445 is an apocalyptic number.

It is an amenable number.

12840445 is a deficient number, since it is larger than the sum of its proper divisors (2926691).

12840445 is an equidigital number, since it uses as much as digits as its factorization.

12840445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59771.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 12840445 is about 3583.3566665907. The cubic root of 12840445 is about 234.1675389647.

The spelling of 12840445 in words is "twelve million, eight hundred forty thousand, four hundred forty-five".