12400423 has 4 divisors (see below), whose sum is σ = 14171920. Its totient is φ = 10628928.

The previous prime is 12400397. The next prime is 12400441. The reversal of 12400423 is 32400421.

12400423 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12400423 - 2¹⁷ = 12269351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12400397 and 12400406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885738 + ... + 885751.

It is an arithmetic number, because the mean of its divisors is an integer number (3542980).

Almost surely, 2^12400423 is an apocalyptic number.

12400423 is a deficient number, since it is larger than the sum of its proper divisors (1771497).

12400423 is an equidigital number, since it uses as much as digits as its factorization.

12400423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771496.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 12400423 is about 3521.4234337836. The cubic root of 12400423 is about 231.4615373344.

Adding to 12400423 its reverse (32400421), we get a palindrome (44800844).

The spelling of 12400423 in words is "twelve million, four hundred thousand, four hundred twenty-three".