11405818 has 8 divisors (see below), whose sum is σ = 17125812. Its totient is φ = 5697216.

The previous prime is 11405809. The next prime is 11405837. The reversal of 11405818 is 81850411.

It can be written as a sum of positive squares in 2 ways, for example, as 10029889 + 1375929 = 3167^2 + 1173^2 .

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, 396 + ... + 4792.

Almost surely, 2^11405818 is an apocalyptic number.

11405818 is a deficient number, since it is larger than the sum of its proper divisors (5719994).

11405818 is a wasteful number, since it uses less digits than its factorization.

11405818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5696.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 11405818 is about 3377.2500647716. The cubic root of 11405818 is about 225.0999917703.

The spelling of 11405818 in words is "eleven million, four hundred five thousand, eight hundred eighteen".