2138685 has 16 divisors (see below), whose sum is σ = 3623616. Its totient is φ = 1073408.

The previous prime is 2138677. The next prime is 2138687. The reversal of 2138685 is 5868312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2138685 - 2³ = 2138677 is a prime.

It is a d-powerful number, because it can be written as 2² + 1 + 3¹¹ + 8⁴ + 6³ + 8⁴ + 5⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3939 + ... + 4448.

It is an arithmetic number, because the mean of its divisors is an integer number (226476).

2^2138685 is an apocalyptic number.

It is an amenable number.

2138685 is a deficient number, since it is larger than the sum of its proper divisors (1484931).

2138685 is a wasteful number, since it uses less digits than its factorization.

2138685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412.

The product of its digits is 11520, while the sum is 33.

The square root of 2138685 is about 1462.4243570182. The cubic root of 2138685 is about 128.8394734214.

The spelling of 2138685 in words is "two million, one hundred thirty-eight thousand, six hundred eighty-five".