172231224 has 64 divisors (see below), whose sum is σ = 471018240. Its totient is φ = 52047360.

The previous prime is 172231223. The next prime is 172231229. The reversal of 172231224 is 422132271.

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

It is a junction number, because it is equal to n+sod(n) for n = 172231194 and 172231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172231223) 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, 132144 + ... + 133440.

It is an arithmetic number, because the mean of its divisors is an integer number (7359660).

Almost surely, 2^172231224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172231224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235509120).

172231224 is an abundant number, since it is smaller than the sum of its proper divisors (298787016).

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

172231224 is a wasteful number, since it uses less digits than its factorization.

172231224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1816 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 172231224 is about 13123.6894202812. The cubic root of 172231224 is about 556.3788715590.

Adding to 172231224 its reverse (422132271), we get a palindrome (594363495).

The spelling of 172231224 in words is "one hundred seventy-two million, two hundred thirty-one thousand, two hundred twenty-four".