172724 has 12 divisors (see below), whose sum is σ = 312900. Its totient is φ = 83328.

The previous prime is 172721. The next prime is 172741. The reversal of 172724 is 427271.

172724 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in 2 ways, for example, as 62500 + 110224 = 250^2 + 332^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 172724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629 + ... + 860.

It is an arithmetic number, because the mean of its divisors is an integer number (26075).

2¹⁷²⁷²⁴ is an apocalyptic number.

It is an amenable number.

172724 is a deficient number, since it is larger than the sum of its proper divisors (140176).

172724 is a wasteful number, since it uses less digits than its factorization.

172724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522 (or 1520 counting only the distinct ones).

The product of its digits is 784, while the sum is 23.

The square root of 172724 is about 415.6007699704. The cubic root of 172724 is about 55.6908990478.

Adding to 172724 its reverse (427271), we get a palindrome (599995).

The spelling of 172724 in words is "one hundred seventy-two thousand, seven hundred twenty-four", and thus it is an iban number.