2001808 has 10 divisors (see below), whose sum is σ = 3878534. Its totient is φ = 1000896.

The previous prime is 2001799. The next prime is 2001809. The reversal of 2001808 is 8081002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1140624 + 861184 = 1068^2 + 928^2 .

It is not an unprimeable number, because it can be changed into a prime (2001809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62541 + ... + 62572.

2^2001808 is an apocalyptic number.

It is an amenable number.

2001808 is a deficient number, since it is larger than the sum of its proper divisors (1876726).

2001808 is a wasteful number, since it uses less digits than its factorization.

2001808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125121 (or 125115 counting only the distinct ones).

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

The square root of 2001808 is about 1414.8526425038. The cubic root of 2001808 is about 126.0300591759.

It can be divided in two parts, 2001 and 808, that added together give a square (2809 = 53²).

The spelling of 2001808 in words is "two million, one thousand, eight hundred eight".