201808 has 10 divisors (see below), whose sum is σ = 391034. Its totient is φ = 100896.

The previous prime is 201797. The next prime is 201809. The reversal of 201808 is 808102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 166464 + 35344 = 408^2 + 188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6291 + ... + 6322.

2²⁰¹⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

201808 is a deficient number, since it is larger than the sum of its proper divisors (189226).

201808 is a wasteful number, since it uses less digits than its factorization.

201808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12621 (or 12615 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 201808 is about 449.2304531084. The cubic root of 201808 is about 58.6560472055.

The spelling of 201808 in words is "two hundred one thousand, eight hundred eight".