111243440 has 80 divisors (see below), whose sum is σ = 322479360. Its totient is φ = 34671360.

The previous prime is 111243413. The next prime is 111243467. The reversal of 111243440 is 44342111.

It is an interprime number because it is at equal distance from previous prime (111243413) and next prime (111243467).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2870 + ... + 15189.

It is an arithmetic number, because the mean of its divisors is an integer number (4030992).

Almost surely, 2^111243440 is an apocalyptic number.

111243440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111243440 is an abundant number, since it is smaller than the sum of its proper divisors (211235920).

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

111243440 is a wasteful number, since it uses less digits than its factorization.

111243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18090 (or 18084 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 111243440 is about 10547.2005764563. The cubic root of 111243440 is about 480.9406323370.

Adding to 111243440 its reverse (44342111), we get a palindrome (155585551).

The spelling of 111243440 in words is "one hundred eleven million, two hundred forty-three thousand, four hundred forty".