2138605 has 32 divisors (see below), whose sum is σ = 3168000. Its totient is φ = 1382976.

The previous prime is 2138593. The next prime is 2138623. The reversal of 2138605 is 5068312.

It is a happy number.

It is not a de Polignac number, because 2138605 - 2⁹ = 2138093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2138605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49714 + ... + 49756.

It is an arithmetic number, because the mean of its divisors is an integer number (99000).

2^2138605 is an apocalyptic number.

It is an amenable number.

2138605 is a deficient number, since it is larger than the sum of its proper divisors (1029395).

2138605 is an equidigital number, since it uses as much as digits as its factorization.

2138605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2138605 is about 1462.3970049203. The cubic root of 2138605 is about 128.8378669379.

The spelling of 2138605 in words is "two million, one hundred thirty-eight thousand, six hundred five".