1906205 has 16 divisors (see below), whose sum is σ = 2643840. Its totient is φ = 1292352.

The previous prime is 1906187. The next prime is 1906211. The reversal of 1906205 is 5026091.

It is a cyclic number.

It is not a de Polignac number, because 1906205 - 2¹⁰ = 1905181 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3491 + ... + 3999.

It is an arithmetic number, because the mean of its divisors is an integer number (165240).

2^1906205 is an apocalyptic number.

It is an amenable number.

1906205 is a deficient number, since it is larger than the sum of its proper divisors (737635).

1906205 is a wasteful number, since it uses less digits than its factorization.

1906205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1906205 is about 1380.6538306179. The cubic root of 1906205 is about 123.9909159145.

The spelling of 1906205 in words is "one million, nine hundred six thousand, two hundred five".