201638 has 8 divisors (see below), whose sum is σ = 309960. Its totient is φ = 98320.

The previous prime is 201629. The next prime is 201653. The reversal of 201638 is 836102.

201638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

201638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (38745).

2²⁰¹⁶³⁸ is an apocalyptic number.

201638 is a deficient number, since it is larger than the sum of its proper divisors (108322).

201638 is a wasteful number, since it uses less digits than its factorization.

201638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 201638 is about 449.0412007823. The cubic root of 201638 is about 58.6395722569.

The spelling of 201638 in words is "two hundred one thousand, six hundred thirty-eight".