2171239 has 12 divisors (see below), whose sum is σ = 2564544. Its totient is φ = 1832544.

The previous prime is 2171231. The next prime is 2171243. The reversal of 2171239 is 9321712.

It is not a de Polignac number, because 2171239 - 2³ = 2171231 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 (2171231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3274 + ... + 3880.

It is an arithmetic number, because the mean of its divisors is an integer number (213712).

2^2171239 is an apocalyptic number.

2171239 is a deficient number, since it is larger than the sum of its proper divisors (393305).

2171239 is an equidigital number, since it uses as much as digits as its factorization.

2171239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 687 counting only the distinct ones).

The product of its digits is 756, while the sum is 25.

The square root of 2171239 is about 1473.5124702560. The cubic root of 2171239 is about 129.4898945121.

The spelling of 2171239 in words is "two million, one hundred seventy-one thousand, two hundred thirty-nine".