111399 has 8 divisors (see below), whose sum is σ = 150912. Its totient is φ = 73080.

The previous prime is 111373. The next prime is 111409. The reversal of 111399 is 993111.

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

It is not a de Polignac number, because 111399 - 2⁷ = 111271 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111599) 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, 49 + ... + 474.

It is an arithmetic number, because the mean of its divisors is an integer number (18864).

2¹¹¹³⁹⁹ is an apocalyptic number.

111399 is a deficient number, since it is larger than the sum of its proper divisors (39513).

111399 is an equidigital number, since it uses as much as digits as its factorization.

111399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597.

The product of its digits is 243, while the sum is 24.

The square root of 111399 is about 333.7648873084. The cubic root of 111399 is about 48.1164706310.

Subtracting from 111399 its product of digits (243), we obtain a triangular number (111156 = T₄₇₁).

The spelling of 111399 in words is "one hundred eleven thousand, three hundred ninety-nine".