2172439 has 4 divisors (see below), whose sum is σ = 2209320. Its totient is φ = 2135560.

The previous prime is 2172433. The next prime is 2172461. The reversal of 2172439 is 9342712.

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

It is a cyclic number.

It is not a de Polignac number, because 2172439 - 2¹³ = 2164247 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 (2172433) 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, 18352 + ... + 18469.

It is an arithmetic number, because the mean of its divisors is an integer number (552330).

2^2172439 is an apocalyptic number.

2172439 is a deficient number, since it is larger than the sum of its proper divisors (36881).

2172439 is an equidigital number, since it uses as much as digits as its factorization.

2172439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36880.

The product of its digits is 3024, while the sum is 28.

The square root of 2172439 is about 1473.9196043204. The cubic root of 2172439 is about 129.5137456029.

The spelling of 2172439 in words is "two million, one hundred seventy-two thousand, four hundred thirty-nine".