2138709 has 8 divisors (see below), whose sum is σ = 2905632. Its totient is φ = 1398800.

The previous prime is 2138693. The next prime is 2138713. The reversal of 2138709 is 9078312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2138709 - 2⁴ = 2138693 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6567 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (363204).

2^2138709 is an apocalyptic number.

It is an amenable number.

2138709 is a deficient number, since it is larger than the sum of its proper divisors (766923).

2138709 is a wasteful number, since it uses less digits than its factorization.

2138709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13507.

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

The square root of 2138709 is about 1462.4325625478. The cubic root of 2138709 is about 128.8399553587.

The spelling of 2138709 in words is "two million, one hundred thirty-eight thousand, seven hundred nine".