2139 has 8 divisors (see below), whose sum is σ = 3072.
Its totient is φ = 1320.
The previous prime is 2137. The next prime is 2141. The reversal of 2139 is 9312.
It can be divided in two parts, 213 and 9, that added together give a palindrome (222).
2139 is nontrivially palindromic in base 15.
2139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (2137) and next prime (2141).
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 2139 - 21 = 2137 is a prime.
It is a d-powerful number, because it can be written as 211 + 34 + 1 + 9 .
2139 is an undulating number in base 15.
It is a nialpdrome in base 13.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2131) 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, 54 + ... + 84.
It is an arithmetic number, because the mean of its divisors is an integer number (384).
2139 is a deficient number, since it is larger than the sum of its proper divisors (933).
2139 is a wasteful number, since it uses less digits than its factorization.
2139 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 57.
The product of its digits is 54, while the sum is 15.
The square root of 2139 is about 46.2493243194.
The cubic root of 2139 is about 12.8845798561.
The spelling of 2139 in words is "two thousand, one hundred thirty-nine".