2168139 has 4 divisors (see below), whose sum is σ = 2890856. Its totient is φ = 1445424.

The previous prime is 2168107. The next prime is 2168143. The reversal of 2168139 is 9318612.

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

It is not a de Polignac number, because 2168139 - 2⁵ = 2168107 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2168149) 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, 361354 + ... + 361359.

It is an arithmetic number, because the mean of its divisors is an integer number (722714).

2^2168139 is an apocalyptic number.

2168139 is a deficient number, since it is larger than the sum of its proper divisors (722717).

2168139 is an equidigital number, since it uses as much as digits as its factorization.

2168139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722716.

The product of its digits is 2592, while the sum is 30.

The square root of 2168139 is about 1472.4601862190. The cubic root of 2168139 is about 129.4282384919.

The spelling of 2168139 in words is "two million, one hundred sixty-eight thousand, one hundred thirty-nine".