11821860 has 36 divisors (see below), whose sum is σ = 35860188. Its totient is φ = 3152448.

The previous prime is 11821853. The next prime is 11821871. The reversal of 11821860 is 6812811.

It can be written as a sum of positive squares in 2 ways, for example, as 2965284 + 8856576 = 1722^2 + 2976^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32659 + ... + 33018.

Almost surely, 2^11821860 is an apocalyptic number.

11821860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11821860 is an abundant number, since it is smaller than the sum of its proper divisors (24038328).

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

11821860 is a wasteful number, since it uses less digits than its factorization.

11821860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65692 (or 65687 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 11821860 is about 3438.2931812165. The cubic root of 11821860 is about 227.8043103911.

The spelling of 11821860 in words is "eleven million, eight hundred twenty-one thousand, eight hundred sixty".