2106139 has 4 divisors (see below), whose sum is σ = 2407024. Its totient is φ = 1805256.

The previous prime is 2106107. The next prime is 2106149. The reversal of 2106139 is 9316012.

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 2106139 - 2⁵ = 2106107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2106149) 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, 150432 + ... + 150445.

It is an arithmetic number, because the mean of its divisors is an integer number (601756).

2^2106139 is an apocalyptic number.

2106139 is a deficient number, since it is larger than the sum of its proper divisors (300885).

2106139 is an equidigital number, since it uses as much as digits as its factorization.

2106139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300884.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2106139 is about 1451.2542850927. The cubic root of 2106139 is about 128.1825804248.

The spelling of 2106139 in words is "two million, one hundred six thousand, one hundred thirty-nine".