172404 has 18 divisors (see below), whose sum is σ = 435890. Its totient is φ = 57456.

The previous prime is 172399. The next prime is 172411. The reversal of 172404 is 404271.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 108900 + 63504 = 330^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

172404 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 5 ways as a sum of consecutive naturals, for example, 2359 + ... + 2430.

2¹⁷²⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

172404 is an abundant number, since it is smaller than the sum of its proper divisors (263486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172404 is a wasteful number, since it uses less digits than its factorization.

172404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4799 (or 4794 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 172404 is about 415.2156066431. The cubic root of 172404 is about 55.6564855624.

Adding to 172404 its reverse (404271), we get a palindrome (576675).

It can be divided in two parts, 172 and 404, that added together give a square (576 = 24²).

The spelling of 172404 in words is "one hundred seventy-two thousand, four hundred four", and thus it is an iban number.