1722213 has 12 divisors (see below), whose sum is σ = 2529228. Its totient is φ = 1128960.

The previous prime is 1722211. The next prime is 1722241. The reversal of 1722213 is 3122271.

It can be written as a sum of positive squares in 2 ways, for example, as 986049 + 736164 = 993^2 + 858^2 .

It is not a de Polignac number, because 1722213 - 2¹ = 1722211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722211) 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 11 ways as a sum of consecutive naturals, for example, 1020 + ... + 2117.

It is an arithmetic number, because the mean of its divisors is an integer number (210769).

2^1722213 is an apocalyptic number.

It is an amenable number.

1722213 is a deficient number, since it is larger than the sum of its proper divisors (807015).

1722213 is a wasteful number, since it uses less digits than its factorization.

1722213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204 (or 3201 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 1722213 is about 1312.3311319938. The cubic root of 1722213 is about 119.8658918475.

Adding to 1722213 its reverse (3122271), we get a palindrome (4844484).

The spelling of 1722213 in words is "one million, seven hundred twenty-two thousand, two hundred thirteen".