111728399 has 8 divisors (see below), whose sum is σ = 114482160. Its totient is φ = 108998656.

The previous prime is 111728389. The next prime is 111728401. The reversal of 111728399 is 993827111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111728399 - 2⁸ = 111728143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111728389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3599 + ... + 15375.

It is an arithmetic number, because the mean of its divisors is an integer number (14310270).

Almost surely, 2^111728399 is an apocalyptic number.

111728399 is a deficient number, since it is larger than the sum of its proper divisors (2753761).

111728399 is a wasteful number, since it uses less digits than its factorization.

111728399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12009.

The product of its digits is 27216, while the sum is 41.

The square root of 111728399 is about 10570.1655143143. The cubic root of 111728399 is about 481.6384963483.

The spelling of 111728399 in words is "one hundred eleven million, seven hundred twenty-eight thousand, three hundred ninety-nine".