111988840 has 32 divisors (see below), whose sum is σ = 262932480. Its totient is φ = 42847552.

The previous prime is 111988837. The next prime is 111988859. The reversal of 111988840 is 48889111.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 111988793 and 111988802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59944 + ... + 61783.

It is an arithmetic number, because the mean of its divisors is an integer number (8216640).

Almost surely, 2^111988840 is an apocalyptic number.

111988840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111988840 is an abundant number, since it is smaller than the sum of its proper divisors (150943640).

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

111988840 is a wasteful number, since it uses less digits than its factorization.

111988840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121761 (or 121757 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 40.

The square root of 111988840 is about 10582.4779706834. The cubic root of 111988840 is about 482.0124420725.

The spelling of 111988840 in words is "one hundred eleven million, nine hundred eighty-eight thousand, eight hundred forty".