172742 has 4 divisors (see below), whose sum is σ = 259116. Its totient is φ = 86370.

The previous prime is 172741. The next prime is 172751. The reversal of 172742 is 247271.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43184 + ... + 43187.

It is an arithmetic number, because the mean of its divisors is an integer number (64779).

2¹⁷²⁷⁴² is an apocalyptic number.

172742 is a deficient number, since it is larger than the sum of its proper divisors (86374).

172742 is an equidigital number, since it uses as much as digits as its factorization.

172742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86373.

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

The square root of 172742 is about 415.6224248041. The cubic root of 172742 is about 55.6928335432.

Subtracting 172742 from its reverse (247271), we obtain a square (74529 = 273²).

The spelling of 172742 in words is "one hundred seventy-two thousand, seven hundred forty-two", and thus it is an iban number.