12172445 has 16 divisors (see below), whose sum is σ = 15795840. Its totient is φ = 8973504.

The previous prime is 12172423. The next prime is 12172469. The reversal of 12172445 is 54427121.

It is a cyclic number.

It is not a de Polignac number, because 12172445 - 2⁸ = 12172189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1784 + ... + 5246.

It is an arithmetic number, because the mean of its divisors is an integer number (987240).

Almost surely, 2^12172445 is an apocalyptic number.

It is an amenable number.

12172445 is a deficient number, since it is larger than the sum of its proper divisors (3623395).

12172445 is a wasteful number, since it uses less digits than its factorization.

12172445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524.

The product of its digits is 2240, while the sum is 26.

The square root of 12172445 is about 3488.9031227594. The cubic root of 12172445 is about 230.0343049020.

Adding to 12172445 its reverse (54427121), we get a palindrome (66599566).

The spelling of 12172445 in words is "twelve million, one hundred seventy-two thousand, four hundred forty-five".