12400111 has 4 divisors (see below), whose sum is σ = 12407224. Its totient is φ = 12393000.

The previous prime is 12400109. The next prime is 12400127. The reversal of 12400111 is 11100421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11100421 = 23 ⋅482627.

It is a cyclic number.

It is not a de Polignac number, because 12400111 - 2¹ = 12400109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400181) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1036 + ... + 5086.

It is an arithmetic number, because the mean of its divisors is an integer number (3101806).

Almost surely, 2^12400111 is an apocalyptic number.

12400111 is a deficient number, since it is larger than the sum of its proper divisors (7113).

12400111 is an equidigital number, since it uses as much as digits as its factorization.

12400111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12400111 is about 3521.3791332374. The cubic root of 12400111 is about 231.4595960940.

Adding to 12400111 its reverse (11100421), we get a palindrome (23500532).

The spelling of 12400111 in words is "twelve million, four hundred thousand, one hundred eleven".