1729225 has 9 divisors (see below), whose sum is σ = 2152423.
Its totient is φ = 1378120.
The previous prime is 1729207. The next prime is 1729229. The reversal of 1729225 is 5229271.
The square root of 1729225 is 1315.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 622521 + 1106704 = 789^2 + 1052^2
It is not a de Polignac number, because 1729225 - 25 = 1729193 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 1729193 and 1729202.
It is not an unprimeable number, because it can be changed into a prime (1729229) by changing a digit.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6444 + ... + 6706.
21729225 is an apocalyptic number.
1729225 is the 1315-th square number.
1729225 is the 658-th centered octagonal number.
It is an amenable number.
1729225 is a deficient number, since it is larger than the sum of its proper divisors (423198).
1729225 is an frugal number, since it uses more digits than its factorization.
1729225 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 536 (or 268 counting only the distinct ones).
The product of its digits is 2520, while the sum is 28.
The cubic root of 1729225 is about 120.0283497834.
The spelling of 1729225 in words is "one million, seven hundred twenty-nine thousand, two hundred twenty-five".