1722643 has 4 divisors (see below), whose sum is σ = 1855168. Its totient is φ = 1590120.

The previous prime is 1722619. The next prime is 1722647. The reversal of 1722643 is 3462271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3462271 = 17 ⋅203663.

It is a cyclic number.

It is not a de Polignac number, because 1722643 - 2⁹ = 1722131 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722647) 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, 66243 + ... + 66268.

It is an arithmetic number, because the mean of its divisors is an integer number (463792).

2^1722643 is an apocalyptic number.

1722643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1722643 is a deficient number, since it is larger than the sum of its proper divisors (132525).

1722643 is a wasteful number, since it uses less digits than its factorization.

1722643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132524.

The product of its digits is 2016, while the sum is 25.

The square root of 1722643 is about 1312.4949523712. The cubic root of 1722643 is about 119.8758670063.

The spelling of 1722643 in words is "one million, seven hundred twenty-two thousand, six hundred forty-three".