40808 has 8 divisors (see below), whose sum is σ = 76530. Its totient is φ = 20400.

The previous prime is 40801. The next prime is 40813. The reversal of 40808 is 80804.

It can be written as a sum of positive squares in only one way, i.e., 40804 + 4 = 202^2 + 2^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 40808.

It is not an unprimeable number, because it can be changed into a prime (40801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2543 + ... + 2558.

2⁴⁰⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

40808 is a deficient number, since it is larger than the sum of its proper divisors (35722).

40808 is a wasteful number, since it uses less digits than its factorization.

40808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107 (or 5103 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 40808 is about 202.0099007475. The cubic root of 40808 is about 34.4282623337.

It can be divided in two parts, 4080 and 8, that multiplied together give a triangular number (32640 = T₂₅₅).

The spelling of 40808 in words is "forty thousand, eight hundred eight".