111991140 has 192 divisors, whose sum is σ = 371589120. Its totient is φ = 27941760.

The previous prime is 111991133. The next prime is 111991141. The reversal of 111991140 is 41199111.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (111991141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 881757 + ... + 881883.

It is an arithmetic number, because the mean of its divisors is an integer number (1935360).

Almost surely, 2^111991140 is an apocalyptic number.

111991140 is a gapful number since it is divisible by the number (10) 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 111991140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185794560).

111991140 is an abundant number, since it is smaller than the sum of its proper divisors (259597980).

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

111991140 is a wasteful number, since it uses less digits than its factorization.

111991140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The square root of 111991140 is about 10582.5866403257. The cubic root of 111991140 is about 482.0157418686.

The spelling of 111991140 in words is "one hundred eleven million, nine hundred ninety-one thousand, one hundred forty".