1742221 has 10 divisors (see below), whose sum is σ = 1918342. Its totient is φ = 1581840.

The previous prime is 1742197. The next prime is 1742249. The reversal of 1742221 is 1222471.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1726596 + 15625 = 1314^2 + 125^2 .

It is not a de Polignac number, because 1742221 - 2¹¹ = 1740173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1742261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28531 + ... + 28591.

2^1742221 is an apocalyptic number.

It is an amenable number.

1742221 is a deficient number, since it is larger than the sum of its proper divisors (176121).

1742221 is an frugal number, since it uses more digits than its factorization.

1742221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 74 counting only the distinct ones).

The product of its digits is 224, while the sum is 19.

The square root of 1742221 is about 1319.9321952282. The cubic root of 1742221 is about 120.3282908717.

Adding to 1742221 its reverse (1222471), we get a palindrome (2964692).

The spelling of 1742221 in words is "one million, seven hundred forty-two thousand, two hundred twenty-one".