40409818 has 8 divisors (see below), whose sum is σ = 62704980. Its totient is φ = 19508160.

The previous prime is 40409779. The next prime is 40409839. The reversal of 40409818 is 81890404.

40409818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 37859409 + 2550409 = 6153^2 + 1597^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348303 + ... + 348418.

Almost surely, 2^40409818 is an apocalyptic number.

40409818 is a deficient number, since it is larger than the sum of its proper divisors (22295162).

40409818 is a wasteful number, since it uses less digits than its factorization.

40409818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696752.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 40409818 is about 6356.8717149239. The cubic root of 40409818 is about 343.1591879808.

The spelling of 40409818 in words is "forty million, four hundred nine thousand, eight hundred eighteen".