2138205 has 8 divisors (see below), whose sum is σ = 3421152. Its totient is φ = 1140368.

The previous prime is 2138197. The next prime is 2138207. The reversal of 2138205 is 5028312.

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 2138205 - 2³ = 2138197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138207) 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, 71259 + ... + 71288.

It is an arithmetic number, because the mean of its divisors is an integer number (427644).

2^2138205 is an apocalyptic number.

It is an amenable number.

2138205 is a deficient number, since it is larger than the sum of its proper divisors (1282947).

2138205 is a wasteful number, since it uses less digits than its factorization.

2138205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142555.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2138205 is about 1462.2602367568. The cubic root of 2138205 is about 128.8298339195.

It can be divided in two parts, 21 and 38205, that added together give a triangular number (38226 = T₂₇₆).

The spelling of 2138205 in words is "two million, one hundred thirty-eight thousand, two hundred five".