111999930 has 64 divisors (see below), whose sum is σ = 308613888. Its totient is φ = 25482240.

The previous prime is 111999913. The next prime is 111999977. The reversal of 111999930 is 39999111.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49504 + ... + 51716.

It is an arithmetic number, because the mean of its divisors is an integer number (4822092).

Almost surely, 2^111999930 is an apocalyptic number.

111999930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111999930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154306944).

111999930 is an abundant number, since it is smaller than the sum of its proper divisors (196613958).

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

111999930 is a wasteful number, since it uses less digits than its factorization.

111999930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471.

The product of its (nonzero) digits is 19683, while the sum is 42.

The square root of 111999930 is about 10583.0019370687. The cubic root of 111999930 is about 482.0283524124.

The spelling of 111999930 in words is "one hundred eleven million, nine hundred ninety-nine thousand, nine hundred thirty".