172642 has 8 divisors (see below), whose sum is σ = 266076. Its totient is φ = 83952.

The previous prime is 172633. The next prime is 172643. The reversal of 172642 is 246271.

It can be written as a sum of positive squares in 2 ways, for example, as 168921 + 3721 = 411^2 + 61^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 1 + 7⁶ + 6⁶ + 2⁷ + 4² + 2¹³ .

It is not an unprimeable number, because it can be changed into a prime (172643) 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 in 3 ways as a sum of consecutive naturals, for example, 1093 + ... + 1240.

2¹⁷²⁶⁴² is an apocalyptic number.

172642 is a deficient number, since it is larger than the sum of its proper divisors (93434).

172642 is a wasteful number, since it uses less digits than its factorization.

172642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372.

The product of its digits is 672, while the sum is 22.

The square root of 172642 is about 415.5021058912. The cubic root of 172642 is about 55.6820846453.

The spelling of 172642 in words is "one hundred seventy-two thousand, six hundred forty-two".