11985778 has 16 divisors (see below), whose sum is σ = 21210624. Its totient is φ = 4970880.

The previous prime is 11985773. The next prime is 11985793. The reversal of 11985778 is 87758911.

It is not an unprimeable number, because it can be changed into a prime (11985773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13375 + ... + 14242.

It is an arithmetic number, because the mean of its divisors is an integer number (1325664).

Almost surely, 2^11985778 is an apocalyptic number.

11985778 is a deficient number, since it is larger than the sum of its proper divisors (9224846).

11985778 is a wasteful number, since it uses less digits than its factorization.

11985778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27657.

The product of its digits is 141120, while the sum is 46.

The square root of 11985778 is about 3462.0482376767. The cubic root of 11985778 is about 228.8523676121.

The spelling of 11985778 in words is "eleven million, nine hundred eighty-five thousand, seven hundred seventy-eight".