40818 has 8 divisors (see below), whose sum is σ = 81648. Its totient is φ = 13604.

The previous prime is 40813. The next prime is 40819. The reversal of 40818 is 81804.

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

40818 is an admirable number.

It is a super-2 number, since 2×40818² = 3332218248, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40794 and 40803.

It is not an unprimeable number, because it can be changed into a prime (40813) by changing a digit.

40818 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, 3396 + ... + 3407.

It is an arithmetic number, because the mean of its divisors is an integer number (10206).

2⁴⁰⁸¹⁸ is an apocalyptic number.

40818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40824).

40818 is a wasteful number, since it uses less digits than its factorization.

40818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6808.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 40818 is about 202.0346504934. The cubic root of 40818 is about 34.4310743191.

It can be divided in two parts, 40 and 818, that added together give a palindrome (858).

The spelling of 40818 in words is "forty thousand, eight hundred eighteen".