201905 has 8 divisors (see below), whose sum is σ = 264384. Its totient is φ = 146800.

The previous prime is 201893. The next prime is 201907. The reversal of 201905 is 509102.

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

It is not a de Polignac number, because 201905 - 2⁴ = 201889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201907) 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, 1781 + ... + 1890.

It is an arithmetic number, because the mean of its divisors is an integer number (33048).

2²⁰¹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

201905 is a deficient number, since it is larger than the sum of its proper divisors (62479).

201905 is a wasteful number, since it uses less digits than its factorization.

201905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 201905 is about 449.3384025431. The cubic root of 201905 is about 58.6654434720.

The spelling of 201905 in words is "two hundred one thousand, nine hundred five".