2186139 has 4 divisors (see below), whose sum is σ = 2914856. Its totient is φ = 1457424.

The previous prime is 2186113. The next prime is 2186141. The reversal of 2186139 is 9316812.

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

It is not a de Polignac number, because 2186139 - 2⁷ = 2186011 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 (2186189) 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, 364354 + ... + 364359.

It is an arithmetic number, because the mean of its divisors is an integer number (728714).

2^2186139 is an apocalyptic number.

2186139 is a deficient number, since it is larger than the sum of its proper divisors (728717).

2186139 is an equidigital number, since it uses as much as digits as its factorization.

2186139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728716.

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

The square root of 2186139 is about 1478.5597722108. The cubic root of 2186139 is about 129.7854251154.

The spelling of 2186139 in words is "two million, one hundred eighty-six thousand, one hundred thirty-nine".