2172243 has 16 divisors (see below), whose sum is σ = 3096576. Its totient is φ = 1349760.

The previous prime is 2172241. The next prime is 2172253. The reversal of 2172243 is 3422712.

It is not a de Polignac number, because 2172243 - 2¹ = 2172241 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 1 + 7⁴ + 2¹⁹ + 2¹⁹ + 4⁸ + 3¹² .

2172243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2172241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9630 + ... + 9852.

It is an arithmetic number, because the mean of its divisors is an integer number (193536).

2^2172243 is an apocalyptic number.

2172243 is a deficient number, since it is larger than the sum of its proper divisors (924333).

2172243 is a wasteful number, since it uses less digits than its factorization.

2172243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434.

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

The square root of 2172243 is about 1473.8531134411. The cubic root of 2172243 is about 129.5098505250.

Adding to 2172243 its reverse (3422712), we get a palindrome (5594955).

It can be divided in two parts, 2172 and 243, that added together give a triangular number (2415 = T₆₉).

The spelling of 2172243 in words is "two million, one hundred seventy-two thousand, two hundred forty-three".