11981850 has 72 divisors (see below), whose sum is σ = 31268832. Its totient is φ = 3036000.

The previous prime is 11981839. The next prime is 11981863. The reversal of 11981850 is 5818911.

11981850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 79275 + ... + 79425.

Almost surely, 2^11981850 is an apocalyptic number.

11981850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11981850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15634416).

11981850 is an abundant number, since it is smaller than the sum of its proper divisors (19286982).

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

11981850 is a wasteful number, since it uses less digits than its factorization.

11981850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 33.

The square root of 11981850 is about 3461.4808969573. The cubic root of 11981850 is about 228.8273649153.

The spelling of 11981850 in words is "eleven million, nine hundred eighty-one thousand, eight hundred fifty".