12405545 has 8 divisors (see below), whose sum is σ = 15289224. Its totient is φ = 9656064.

The previous prime is 12405541. The next prime is 12405557. The reversal of 12405545 is 54550421.

It can be written as a sum of positive squares in 4 ways, for example, as 6270016 + 6135529 = 2504^2 + 2477^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12405545 - 2² = 12405541 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12405541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33344 + ... + 33713.

It is an arithmetic number, because the mean of its divisors is an integer number (1911153).

Almost surely, 2^12405545 is an apocalyptic number.

It is an amenable number.

12405545 is a deficient number, since it is larger than the sum of its proper divisors (2883679).

12405545 is an equidigital number, since it uses as much as digits as its factorization.

12405545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67099.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 12405545 is about 3522.1506214244. The cubic root of 12405545 is about 231.4934013765.

Adding to 12405545 its reverse (54550421), we get a palindrome (66955966).

The spelling of 12405545 in words is "twelve million, four hundred five thousand, five hundred forty-five".