12400043 has 2 divisors, whose sum is σ = 12400044. Its totient is φ = 12400042.

The previous prime is 12400009. The next prime is 12400049. The reversal of 12400043 is 34000421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12400043 - 2⁸ = 12399787 is a prime.

It is a super-2 number, since 2×12400043² = 307522132803698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12400049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200021 + 6200022.

It is an arithmetic number, because the mean of its divisors is an integer number (6200022).

Almost surely, 2^12400043 is an apocalyptic number.

12400043 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400043 is an equidigital number, since it uses as much as digits as its factorization.

12400043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 12400043 is about 3521.3694779162. The cubic root of 12400043 is about 231.4591729989.

Adding to 12400043 its reverse (34000421), we get a palindrome (46400464).

The spelling of 12400043 in words is "twelve million, four hundred thousand, forty-three".