2139891 has 8 divisors (see below), whose sum is σ = 3072720. Its totient is φ = 1316832.

The previous prime is 2139877. The next prime is 2139911. The reversal of 2139891 is 1989312.

2139891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2139891 - 2⁵ = 2139859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27396 + ... + 27473.

It is an arithmetic number, because the mean of its divisors is an integer number (384090).

2^2139891 is an apocalyptic number.

2139891 is a deficient number, since it is larger than the sum of its proper divisors (932829).

2139891 is a wasteful number, since it uses less digits than its factorization.

2139891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54885.

The product of its digits is 3888, while the sum is 33.

The square root of 2139891 is about 1462.8366279253. The cubic root of 2139891 is about 128.8636863074.

The spelling of 2139891 in words is "two million, one hundred thirty-nine thousand, eight hundred ninety-one".