12691224 has 144 divisors (see below), whose sum is σ = 42822000. Its totient is φ = 3324672.

The previous prime is 12691223. The next prime is 12691243. The reversal of 12691224 is 42219621.

It is a super-2 number, since 2×12691224² = 322134333236352, which contains 22 as substring.

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 (12691223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 85102 + ... + 85250.

It is an arithmetic number, because the mean of its divisors is an integer number (297375).

Almost surely, 2^12691224 is an apocalyptic number.

12691224 is a gapful number since it is divisible by the number (14) 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 12691224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21411000).

12691224 is an abundant number, since it is smaller than the sum of its proper divisors (30130776).

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

12691224 is a wasteful number, since it uses less digits than its factorization.

12691224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 174 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 12691224 is about 3562.4744209608. The cubic root of 12691224 is about 233.2569019508.

The spelling of 12691224 in words is "twelve million, six hundred ninety-one thousand, two hundred twenty-four".