11912820 has 48 divisors (see below), whose sum is σ = 33508608. Its totient is φ = 3162240.

The previous prime is 11912807. The next prime is 11912821. The reversal of 11912820 is 2821911.

It is a super-3 number, since 3×11912820³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11912821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21750 + ... + 22290.

It is an arithmetic number, because the mean of its divisors is an integer number (698096).

Almost surely, 2^11912820 is an apocalyptic number.

11912820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11912820 is an abundant number, since it is smaller than the sum of its proper divisors (21595788).

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

11912820 is a wasteful number, since it uses less digits than its factorization.

11912820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 11912820 is about 3451.4953281150. The cubic root of 11912820 is about 228.3870771721.

Subtracting from 11912820 its reverse (2821911), we obtain a palindrome (9090909).

The spelling of 11912820 in words is "eleven million, nine hundred twelve thousand, eight hundred twenty".