2166279 has 4 divisors (see below), whose sum is σ = 2888376. Its totient is φ = 1444184.

The previous prime is 2166251. The next prime is 2166289. The reversal of 2166279 is 9726612.

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 2166279 - 2⁸ = 2166023 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166289) 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, 361044 + ... + 361049.

It is an arithmetic number, because the mean of its divisors is an integer number (722094).

2^2166279 is an apocalyptic number.

2166279 is a deficient number, since it is larger than the sum of its proper divisors (722097).

2166279 is an equidigital number, since it uses as much as digits as its factorization.

2166279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722096.

The product of its digits is 9072, while the sum is 33.

The square root of 2166279 is about 1471.8284546781. The cubic root of 2166279 is about 129.3912166654.

The spelling of 2166279 in words is "two million, one hundred sixty-six thousand, two hundred seventy-nine".