11778918 has 8 divisors (see below), whose sum is σ = 23557848. Its totient is φ = 3926304.

The previous prime is 11778911. The next prime is 11778919. The reversal of 11778918 is 81987711.

It is a happy number.

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

11778918 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 11778918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778911) 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, 981571 + ... + 981582.

It is an arithmetic number, because the mean of its divisors is an integer number (2944731).

Almost surely, 2^11778918 is an apocalyptic number.

11778918 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.

11778918 is a wasteful number, since it uses less digits than its factorization.

11778918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963158.

The product of its digits is 28224, while the sum is 42.

The square root of 11778918 is about 3432.0428319006. The cubic root of 11778918 is about 227.5281485116.

The spelling of 11778918 in words is "eleven million, seven hundred seventy-eight thousand, nine hundred eighteen".