172438 has 16 divisors (see below), whose sum is σ = 300960. Its totient is φ = 72576.

The previous prime is 172433. The next prime is 172439. The reversal of 172438 is 834271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172433) by changing a digit.

172438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1470 + ... + 1582.

It is an arithmetic number, because the mean of its divisors is an integer number (18810).

2¹⁷²⁴³⁸ is an apocalyptic number.

172438 is a deficient number, since it is larger than the sum of its proper divisors (128522).

172438 is a wasteful number, since it uses less digits than its factorization.

172438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231.

The product of its digits is 1344, while the sum is 25.

The square root of 172438 is about 415.2565472091. The cubic root of 172438 is about 55.6601440160.

The spelling of 172438 in words is "one hundred seventy-two thousand, four hundred thirty-eight".