12406557 has 4 divisors (see below), whose sum is σ = 16542080. Its totient is φ = 8271036.

The previous prime is 12406531. The next prime is 12406561. The reversal of 12406557 is 75560421.

12406557 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75560421 = 3 ⋅25186807.

It is not a de Polignac number, because 12406557 - 2¹² = 12402461 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 (12406517) 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, 2067757 + ... + 2067762.

It is an arithmetic number, because the mean of its divisors is an integer number (4135520).

Almost surely, 2^12406557 is an apocalyptic number.

It is an amenable number.

12406557 is a deficient number, since it is larger than the sum of its proper divisors (4135523).

12406557 is an equidigital number, since it uses as much as digits as its factorization.

12406557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135522.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 12406557 is about 3522.2942807210. The cubic root of 12406557 is about 231.4996960066.

Adding to 12406557 its reverse (75560421), we get a palindrome (87966978).

The spelling of 12406557 in words is "twelve million, four hundred six thousand, five hundred fifty-seven".