172418 has 4 divisors (see below), whose sum is σ = 258630. Its totient is φ = 86208.

The previous prime is 172411. The next prime is 172421. The reversal of 172418 is 814271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 814271 = 179 ⋅4549.

It can be written as a sum of positive squares in only one way, i.e., 170569 + 1849 = 413^2 + 43^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172393 and 172402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172411) by changing a digit.

172418 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 as a sum of consecutive naturals, namely, 43103 + ... + 43106.

2¹⁷²⁴¹⁸ is an apocalyptic number.

172418 is a deficient number, since it is larger than the sum of its proper divisors (86212).

172418 is an equidigital number, since it uses as much as digits as its factorization.

172418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86211.

The product of its digits is 448, while the sum is 23.

The square root of 172418 is about 415.2324650121. The cubic root of 172418 is about 55.6579920427.

Adding to 172418 its reverse (814271), we get a palindrome (986689).

The spelling of 172418 in words is "one hundred seventy-two thousand, four hundred eighteen".