1722243 has 4 divisors (see below), whose sum is σ = 2296328. Its totient is φ = 1148160.

The previous prime is 1722241. The next prime is 1722251. The reversal of 1722243 is 3422271.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1722243 - 2¹ = 1722241 is a prime.

It is a super-2 number, since 2×1722243² = 5932241902098, which contains 22 as substring.

It is a d-powerful number, because it can be written as 1 + 7⁶ + 2¹² + 2¹⁴ + 2²⁰ + 4⁶ + 3¹² .

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722241) 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, 287038 + ... + 287043.

It is an arithmetic number, because the mean of its divisors is an integer number (574082).

2^1722243 is an apocalyptic number.

1722243 is a deficient number, since it is larger than the sum of its proper divisors (574085).

1722243 is an equidigital number, since it uses as much as digits as its factorization.

1722243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574084.

The product of its digits is 672, while the sum is 21.

The square root of 1722243 is about 1312.3425619860. The cubic root of 1722243 is about 119.8665878427.

It can be divided in two parts, 172 and 2243, that added together give a triangular number (2415 = T₆₉).

The spelling of 1722243 in words is "one million, seven hundred twenty-two thousand, two hundred forty-three".