2101939 has 4 divisors (see below), whose sum is σ = 2402224. Its totient is φ = 1801656.

The previous prime is 2101909. The next prime is 2101961. The reversal of 2101939 is 9391012.

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 2101939 - 2⁵ = 2101907 is a prime.

It is an Ulam number.

It is a Duffinian number.

2101939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2101909) 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, 150132 + ... + 150145.

It is an arithmetic number, because the mean of its divisors is an integer number (600556).

2^2101939 is an apocalyptic number.

2101939 is a deficient number, since it is larger than the sum of its proper divisors (300285).

2101939 is an equidigital number, since it uses as much as digits as its factorization.

2101939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300284.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 2101939 is about 1449.8065388182. The cubic root of 2101939 is about 128.0973177554.

The spelling of 2101939 in words is "two million, one hundred one thousand, nine hundred thirty-nine".