111639380 has 12 divisors (see below), whose sum is σ = 234442740. Its totient is φ = 44655744.

The previous prime is 111639373. The next prime is 111639389. The reversal of 111639380 is 83936111.

It can be written as a sum of positive squares in 2 ways, for example, as 77510416 + 34128964 = 8804^2 + 5842^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111639389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2790965 + ... + 2791004.

It is an arithmetic number, because the mean of its divisors is an integer number (19536895).

Almost surely, 2^111639380 is an apocalyptic number.

111639380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111639380 is an abundant number, since it is smaller than the sum of its proper divisors (122803360).

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

111639380 is a wasteful number, since it uses less digits than its factorization.

111639380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581978 (or 5581976 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 111639380 is about 10565.9538140198. The cubic root of 111639380 is about 481.5105480692.

The spelling of 111639380 in words is "one hundred eleven million, six hundred thirty-nine thousand, three hundred eighty".