12405172 has 24 divisors (see below), whose sum is σ = 24755976. Its totient is φ = 5388288.

The previous prime is 12405167. The next prime is 12405187. The reversal of 12405172 is 27150421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 197136 + 12208036 = 444^2 + 3494^2 .

It is a congruent number.

It is an unprimeable number.

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, 6133 + ... + 7900.

It is an arithmetic number, because the mean of its divisors is an integer number (1031499).

Almost surely, 2^12405172 is an apocalyptic number.

It is an amenable number.

12405172 is a deficient number, since it is larger than the sum of its proper divisors (12350804).

12405172 is a wasteful number, since it uses less digits than its factorization.

12405172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14067 (or 14065 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 12405172 is about 3522.0976704231. The cubic root of 12405172 is about 231.4910812338.

Adding to 12405172 its reverse (27150421), we get a palindrome (39555593).

The spelling of 12405172 in words is "twelve million, four hundred five thousand, one hundred seventy-two".