12172270 has 32 divisors (see below), whose sum is σ = 24053760. Its totient is φ = 4398240.

The previous prime is 12172253. The next prime is 12172271. The reversal of 12172270 is 7227121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26059 + ... + 26521.

It is an arithmetic number, because the mean of its divisors is an integer number (751680).

Almost surely, 2^12172270 is an apocalyptic number.

12172270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12172270 is a deficient number, since it is larger than the sum of its proper divisors (11881490).

12172270 is a wasteful number, since it uses less digits than its factorization.

12172270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 12172270 is about 3488.8780431537. The cubic root of 12172270 is about 230.0332025161.

Adding to 12172270 its reverse (7227121), we get a palindrome (19399391).

The spelling of 12172270 in words is "twelve million, one hundred seventy-two thousand, two hundred seventy".