2139807 has 8 divisors (see below), whose sum is σ = 3020976. Its totient is φ = 1342592.

The previous prime is 2139757. The next prime is 2139811. The reversal of 2139807 is 7089312.

It is a happy number.

2139807 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 2139807 - 2⁶ = 2139743 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139817) 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, 20928 + ... + 21029.

It is an arithmetic number, because the mean of its divisors is an integer number (377622).

2^2139807 is an apocalyptic number.

2139807 is a deficient number, since it is larger than the sum of its proper divisors (881169).

2139807 is a wasteful number, since it uses less digits than its factorization.

2139807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41977.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2139807 is about 1462.8079163034. The cubic root of 2139807 is about 128.8620001325.

The spelling of 2139807 in words is "two million, one hundred thirty-nine thousand, eight hundred seven".