12172272 has 80 divisors (see below), whose sum is σ = 38068992. Its totient is φ = 3271680.

The previous prime is 12172271. The next prime is 12172273. The reversal of 12172272 is 27227121.

It is an interprime number because it is at equal distance from previous prime (12172271) and next prime (12172273).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4647 + ... + 6777.

Almost surely, 2^12172272 is an apocalyptic number.

12172272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12172272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19034496).

12172272 is an abundant number, since it is smaller than the sum of its proper divisors (25896720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12172272 is a wasteful number, since it uses less digits than its factorization.

12172272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2160 counting only the distinct ones).

The product of its digits is 784, while the sum is 24.

The square root of 12172272 is about 3488.8783297788. The cubic root of 12172272 is about 230.0332151148.

Adding to 12172272 its reverse (27227121), we get a palindrome (39399393).

The spelling of 12172272 in words is "twelve million, one hundred seventy-two thousand, two hundred seventy-two".