1722361 has 4 divisors (see below), whose sum is σ = 1725300. Its totient is φ = 1719424.

The previous prime is 1722359. The next prime is 1722373. The reversal of 1722361 is 1632271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1632271 = 19 ⋅85909.

It can be written as a sum of positive squares in 2 ways, for example, as 1010025 + 712336 = 1005^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722361 - 2¹ = 1722359 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 (1720361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256 + ... + 1873.

It is an arithmetic number, because the mean of its divisors is an integer number (431325).

2^1722361 is an apocalyptic number.

It is an amenable number.

1722361 is a deficient number, since it is larger than the sum of its proper divisors (2939).

1722361 is an equidigital number, since it uses as much as digits as its factorization.

1722361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938.

The product of its digits is 504, while the sum is 22.

The square root of 1722361 is about 1312.3875189897. The cubic root of 1722361 is about 119.8693253454.

The spelling of 1722361 in words is "one million, seven hundred twenty-two thousand, three hundred sixty-one".