11911812 has 96 divisors (see below), whose sum is σ = 32514048. Its totient is φ = 3360000.

The previous prime is 11911811. The next prime is 11911813. The reversal of 11911812 is 21811911.

It is an interprime number because it is at equal distance from previous prime (11911811) and next prime (11911813).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (11911811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167737 + ... + 167807.

It is an arithmetic number, because the mean of its divisors is an integer number (338688).

Almost surely, 2^11911812 is an apocalyptic number.

11911812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11911812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16257024).

11911812 is an abundant number, since it is smaller than the sum of its proper divisors (20602236).

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

11911812 is a wasteful number, since it uses less digits than its factorization.

11911812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 159 counting only the distinct ones).

The product of its digits is 144, while the sum is 24.

The square root of 11911812 is about 3451.3493013603. The cubic root of 11911812 is about 228.3806353538.

Subtracting 11911812 from its reverse (21811911), we obtain a palindrome (9900099).

It can be divided in two parts, 1191 and 1812, that added together give a palindrome (3003).

The spelling of 11911812 in words is "eleven million, nine hundred eleven thousand, eight hundred twelve".