111909924 has 240 divisors, whose sum is σ = 365904000. Its totient is φ = 29719872.

The previous prime is 111909923. The next prime is 111909953. The reversal of 111909924 is 429909111.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (111909923) 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 79 ways as a sum of consecutive naturals, for example, 2111482 + ... + 2111534.

It is an arithmetic number, because the mean of its divisors is an integer number (1524600).

Almost surely, 2^111909924 is an apocalyptic number.

111909924 is a gapful number since it is divisible by the number (14) 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 111909924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182952000).

111909924 is an abundant number, since it is smaller than the sum of its proper divisors (253994076).

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

111909924 is a wasteful number, since it uses less digits than its factorization.

111909924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 111909924 is about 10578.7486972704. The cubic root of 111909924 is about 481.8991943824.

The spelling of 111909924 in words is "one hundred eleven million, nine hundred nine thousand, nine hundred twenty-four".