172401 has 4 divisors (see below), whose sum is σ = 229872. Its totient is φ = 114932.
The previous prime is 172399. The next prime is 172411. The reversal of 172401 is 104271.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104271 = 3 ⋅34757.
It is a cyclic number.
It is not a de Polignac number, because 172401 - 21 = 172399 is a prime.
It is a D-number.
172401 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (172411) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28731 + ... + 28736.
It is an arithmetic number, because the mean of its divisors is an integer number (57468).
2172401 is an apocalyptic number.
It is an amenable number.
172401 is a deficient number, since it is larger than the sum of its proper divisors (57471).
172401 is an equidigital number, since it uses as much as digits as its factorization.
172401 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 57470.
The product of its (nonzero) digits is 56, while the sum is 15.
The square root of 172401 is about 415.2119940464. The cubic root of 172401 is about 55.6561627346.
Adding to 172401 its reverse (104271), we get a palindrome (276672).
The spelling of 172401 in words is "one hundred seventy-two thousand, four hundred one", and thus it is an iban number.
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