40681808 has 20 divisors (see below), whose sum is σ = 79522068. Its totient is φ = 20160000.

The previous prime is 40681801. The next prime is 40681813. The reversal of 40681808 is 80818604.

It can be written as a sum of positive squares in 2 ways, for example, as 22771984 + 17909824 = 4772^2 + 4232^2 .

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40681801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9443 + ... + 13058.

Almost surely, 2^40681808 is an apocalyptic number.

It is an amenable number.

40681808 is a deficient number, since it is larger than the sum of its proper divisors (38840260).

40681808 is a wasteful number, since it uses less digits than its factorization.

40681808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22622 (or 22616 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 40681808 is about 6378.2292213435. The cubic root of 40681808 is about 343.9273778553.

It can be divided in two parts, 4068 and 1808, that multiplied together give a square (7354944 = 2712²).

The spelling of 40681808 in words is "forty million, six hundred eighty-one thousand, eight hundred eight".