12843994 has 4 divisors (see below), whose sum is σ = 19265994. Its totient is φ = 6421996.

The previous prime is 12843991. The next prime is 12844003. The reversal of 12843994 is 49934821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49934821 = 47 ⋅1062443.

It can be written as a sum of positive squares in only one way, i.e., 6568969 + 6275025 = 2563^2 + 2505^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12843991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210997 + ... + 3211000.

Almost surely, 2^12843994 is an apocalyptic number.

12843994 is a deficient number, since it is larger than the sum of its proper divisors (6422000).

12843994 is an equidigital number, since it uses as much as digits as its factorization.

12843994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6421999.

The product of its digits is 62208, while the sum is 40.

The square root of 12843994 is about 3583.8518384554. The cubic root of 12843994 is about 234.1891110114.

The spelling of 12843994 in words is "twelve million, eight hundred forty-three thousand, nine hundred ninety-four".