11987778 has 32 divisors (see below), whose sum is σ = 26867520. Its totient is φ = 3533760.

The previous prime is 11987753. The next prime is 11987779. The reversal of 11987778 is 87778911.

It is not an unprimeable number, because it can be changed into a prime (11987779) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13 + ... + 4896.

It is an arithmetic number, because the mean of its divisors is an integer number (839610).

Almost surely, 2^11987778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11987778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13433760).

11987778 is an abundant number, since it is smaller than the sum of its proper divisors (14879742).

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

11987778 is a wasteful number, since it uses less digits than its factorization.

11987778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962.

The product of its digits is 197568, while the sum is 48.

The square root of 11987778 is about 3462.3370719790. The cubic root of 11987778 is about 228.8650960106.

It can be divided in two parts, 11 and 987778, that added together give a palindrome (987789).

The spelling of 11987778 in words is "eleven million, nine hundred eighty-seven thousand, seven hundred seventy-eight".