12406691 has 4 divisors (see below), whose sum is σ = 13534584. Its totient is φ = 11278800.

The previous prime is 12406687. The next prime is 12406703. The reversal of 12406691 is 19660421.

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 12406691 - 2² = 12406687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12406621) 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, 563930 + ... + 563951.

It is an arithmetic number, because the mean of its divisors is an integer number (3383646).

Almost surely, 2^12406691 is an apocalyptic number.

12406691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12406691 is a deficient number, since it is larger than the sum of its proper divisors (1127893).

12406691 is a wasteful number, since it uses less digits than its factorization.

12406691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127892.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 12406691 is about 3522.3133023625. The cubic root of 12406691 is about 231.5005294597.

The spelling of 12406691 in words is "twelve million, four hundred six thousand, six hundred ninety-one".