2681939 has 4 divisors (see below), whose sum is σ = 2888256. Its totient is φ = 2475624.

The previous prime is 2681929. The next prime is 2681951. The reversal of 2681939 is 9391862.

2681939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9391862 = 2 ⋅4695931.

It is a cyclic number.

It is not a de Polignac number, because 2681939 - 2⁸ = 2681683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681929) 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 3 ways as a sum of consecutive naturals, for example, 103139 + ... + 103164.

It is an arithmetic number, because the mean of its divisors is an integer number (722064).

2^2681939 is an apocalyptic number.

2681939 is a deficient number, since it is larger than the sum of its proper divisors (206317).

2681939 is a wasteful number, since it uses less digits than its factorization.

2681939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206316.

The product of its digits is 23328, while the sum is 38.

The square root of 2681939 is about 1637.6626636765. The cubic root of 2681939 is about 138.9364822018.

The spelling of 2681939 in words is "two million, six hundred eighty-one thousand, nine hundred thirty-nine".