2166439 has 8 divisors (see below), whose sum is σ = 2466432. Its totient is φ = 1883640.

The previous prime is 2166431. The next prime is 2166449. The reversal of 2166439 is 9346612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2166439 - 2³ = 2166431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4029 + ... + 4534.

It is an arithmetic number, because the mean of its divisors is an integer number (308304).

2^2166439 is an apocalyptic number.

2166439 is a deficient number, since it is larger than the sum of its proper divisors (299993).

2166439 is a wasteful number, since it uses less digits than its factorization.

2166439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8597.

The product of its digits is 7776, while the sum is 31.

The square root of 2166439 is about 1471.8828078349. The cubic root of 2166439 is about 129.3944021716.

The spelling of 2166439 in words is "two million, one hundred sixty-six thousand, four hundred thirty-nine".