111405660 has 48 divisors (see below), whose sum is σ = 314235936. Its totient is φ = 29489152.

The previous prime is 111405659. The next prime is 111405673. The reversal of 111405660 is 66504111.

It is a super-2 number, since 2×111405660² = 24822442160071200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111405660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444 + ... + 14996.

It is an arithmetic number, because the mean of its divisors is an integer number (6546582).

Almost surely, 2^111405660 is an apocalyptic number.

111405660 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 111405660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157117968).

111405660 is an abundant number, since it is smaller than the sum of its proper divisors (202830276).

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

111405660 is a wasteful number, since it uses less digits than its factorization.

111405660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13702 (or 13700 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 111405660 is about 10554.8879671932. The cubic root of 111405660 is about 481.1742949448.

Adding to 111405660 its reverse (66504111), we get a palindrome (177909771).

The spelling of 111405660 in words is "one hundred eleven million, four hundred five thousand, six hundred sixty".