2171399 has 4 divisors (see below), whose sum is σ = 2193000. Its totient is φ = 2149800.

The previous prime is 2171387. The next prime is 2171431. The reversal of 2171399 is 9931712.

It is a happy number.

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 2171399 - 2⁴ = 2171383 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 (2171329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10649 + ... + 10850.

It is an arithmetic number, because the mean of its divisors is an integer number (548250).

2^2171399 is an apocalyptic number.

2171399 is a deficient number, since it is larger than the sum of its proper divisors (21601).

2171399 is a wasteful number, since it uses less digits than its factorization.

2171399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21600.

The product of its digits is 3402, while the sum is 32.

The square root of 2171399 is about 1473.5667612972. The cubic root of 2171399 is about 129.4930751653.

It can be divided in two parts, 21713 and 99, that added together give a palindrome (21812).

The spelling of 2171399 in words is "two million, one hundred seventy-one thousand, three hundred ninety-nine".