201890 has 16 divisors (see below), whose sum is σ = 391608. Its totient is φ = 74496.

The previous prime is 201889. The next prime is 201893. The reversal of 201890 is 98102.

201890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 80089 + 121801 = 283^2 + 349^2 .

It is not an unprimeable number, because it can be changed into a prime (201893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647 + ... + 906.

2²⁰¹⁸⁹⁰ is an apocalyptic number.

201890 is a deficient number, since it is larger than the sum of its proper divisors (189718).

201890 is a wasteful number, since it uses less digits than its factorization.

201890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 201890 is about 449.3217110267. The cubic root of 201890 is about 58.6639906378.

Adding to 201890 its reverse (98102), we get a palindrome (299992).

The spelling of 201890 in words is "two hundred one thousand, eight hundred ninety".