12783845 has 12 divisors (see below), whose sum is σ = 15555276. Its totient is φ = 10085760.

The previous prime is 12783839. The next prime is 12783851. The reversal of 12783845 is 54838721.

It is an interprime number because it is at equal distance from previous prime (12783839) and next prime (12783851).

It can be written as a sum of positive squares in 2 ways, for example, as 7171684 + 5612161 = 2678^2 + 2369^2 .

It is not a de Polignac number, because 12783845 - 2¹⁸ = 12521701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12783799 and 12783808.

It is a congruent number.

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, 52925 + ... + 53165.

It is an arithmetic number, because the mean of its divisors is an integer number (1296273).

Almost surely, 2^12783845 is an apocalyptic number.

It is an amenable number.

12783845 is a deficient number, since it is larger than the sum of its proper divisors (2771431).

12783845 is an equidigital number, since it uses as much as digits as its factorization.

12783845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 349 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 12783845 is about 3575.4503212882. The cubic root of 12783845 is about 233.8229661540.

The spelling of 12783845 in words is "twelve million, seven hundred eighty-three thousand, eight hundred forty-five".