12406399 has 4 divisors (see below), whose sum is σ = 12640536. Its totient is φ = 12172264.

The previous prime is 12406393. The next prime is 12406421. The reversal of 12406399 is 99360421.

12406399 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99360421 = 1907 ⋅52103.

It is a cyclic number.

It is not a de Polignac number, because 12406399 - 2³ = 12406391 is a prime.

It is a super-2 number, since 2×12406399² = 307837472294402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12406391) 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, 116989 + ... + 117094.

It is an arithmetic number, because the mean of its divisors is an integer number (3160134).

Almost surely, 2^12406399 is an apocalyptic number.

12406399 is a deficient number, since it is larger than the sum of its proper divisors (234137).

12406399 is an equidigital number, since it uses as much as digits as its factorization.

12406399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234136.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 12406399 is about 3522.2718520864. The cubic root of 12406399 is about 231.4987132707.

The spelling of 12406399 in words is "twelve million, four hundred six thousand, three hundred ninety-nine".