40813818 has 16 divisors (see below), whose sum is σ = 81772416. Its totient is φ = 13580480.

The previous prime is 40813783. The next prime is 40813823. The reversal of 40813818 is 81831804.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2178 + ... + 9293.

It is an arithmetic number, because the mean of its divisors is an integer number (5110776).

Almost surely, 2^40813818 is an apocalyptic number.

40813818 is an abundant number, since it is smaller than the sum of its proper divisors (40958598).

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

40813818 is a wasteful number, since it uses less digits than its factorization.

40813818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12069.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 40813818 is about 6388.5693234088. The cubic root of 40813818 is about 344.2989840266.

It can be divided in two parts, 408138 and 18, that added together give a triangular number (408156 = T₉₀₃).

The spelling of 40813818 in words is "forty million, eight hundred thirteen thousand, eight hundred eighteen".