11931816 has 64 divisors (see below), whose sum is σ = 32457600. Its totient is φ = 3633408.

The previous prime is 11931811. The next prime is 11931817. The reversal of 11931816 is 61813911.

It is not an unprimeable number, because it can be changed into a prime (11931811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51990 + ... + 52218.

It is an arithmetic number, because the mean of its divisors is an integer number (507150).

Almost surely, 2^11931816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11931816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16228800).

11931816 is an abundant number, since it is smaller than the sum of its proper divisors (20525784).

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

11931816 is a wasteful number, since it uses less digits than its factorization.

11931816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 414 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 11931816 is about 3454.2460827220. The cubic root of 11931816 is about 228.5084068812.

The spelling of 11931816 in words is "eleven million, nine hundred thirty-one thousand, eight hundred sixteen".