1745221 has 4 divisors (see below), whose sum is σ = 1747872. Its totient is φ = 1742572.

The previous prime is 1745213. The next prime is 1745231. The reversal of 1745221 is 1225471.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1745221 - 2³ = 1745213 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1745192 and 1745201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1745231) 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, 510 + ... + 1936.

It is an arithmetic number, because the mean of its divisors is an integer number (436968).

2^1745221 is an apocalyptic number.

It is an amenable number.

1745221 is a deficient number, since it is larger than the sum of its proper divisors (2651).

1745221 is a wasteful number, since it uses less digits than its factorization.

1745221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650.

The product of its digits is 560, while the sum is 22.

The square root of 1745221 is about 1321.0681284476. The cubic root of 1745221 is about 120.3973172988.

The spelling of 1745221 in words is "one million, seven hundred forty-five thousand, two hundred twenty-one".