12840874 has 4 divisors (see below), whose sum is σ = 19261314. Its totient is φ = 6420436.

The previous prime is 12840871. The next prime is 12840911. The reversal of 12840874 is 47804821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47804821 = 31 ⋅1542091.

It can be written as a sum of positive squares in only one way, i.e., 7800849 + 5040025 = 2793^2 + 2245^2 .

It is not an unprimeable number, because it can be changed into a prime (12840871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210217 + ... + 3210220.

Almost surely, 2^12840874 is an apocalyptic number.

12840874 is a deficient number, since it is larger than the sum of its proper divisors (6420440).

12840874 is an equidigital number, since it uses as much as digits as its factorization.

12840874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6420439.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 12840874 is about 3583.4165261661. The cubic root of 12840874 is about 234.1701467859.

The spelling of 12840874 in words is "twelve million, eight hundred forty thousand, eight hundred seventy-four".