172706 has 4 divisors (see below), whose sum is σ = 259062. Its totient is φ = 86352.

The previous prime is 172687. The next prime is 172709. The reversal of 172706 is 607271.

It is a happy number.

172706 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 607271 = 7 ⋅86753.

It can be written as a sum of positive squares in only one way, i.e., 105625 + 67081 = 325^2 + 259^2 .

172706 is an undulating number in base 16.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43175 + ... + 43178.

2¹⁷²⁷⁰⁶ is an apocalyptic number.

172706 is a deficient number, since it is larger than the sum of its proper divisors (86356).

172706 is an equidigital number, since it uses as much as digits as its factorization.

172706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86355.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 172706 is about 415.5791140084. The cubic root of 172706 is about 55.6889644180.

Adding to 172706 its reverse (607271), we get a palindrome (779977).

It can be divided in two parts, 172 and 706, that added together give a palindrome (878).

The spelling of 172706 in words is "one hundred seventy-two thousand, seven hundred six".