11821872 has 20 divisors (see below), whose sum is σ = 30539960. Its totient is φ = 3940608.

The previous prime is 11821871. The next prime is 11821877. The reversal of 11821872 is 27812811.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11821871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123097 + ... + 123192.

It is an arithmetic number, because the mean of its divisors is an integer number (1526998).

Almost surely, 2^11821872 is an apocalyptic number.

11821872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11821872 is an abundant number, since it is smaller than the sum of its proper divisors (18718088).

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

11821872 is a wasteful number, since it uses less digits than its factorization.

11821872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246300 (or 246294 counting only the distinct ones).

The product of its digits is 1792, while the sum is 30.

The square root of 11821872 is about 3438.2949262680. The cubic root of 11821872 is about 227.8043874701.

The spelling of 11821872 in words is "eleven million, eight hundred twenty-one thousand, eight hundred seventy-two".