1111440 has 80 divisors (see below), whose sum is σ = 3767616. Its totient is φ = 268800.

The previous prime is 1111433. The next prime is 1111447. The reversal of 1111440 is 441111.

It is an interprime number because it is at equal distance from previous prime (1111433) and next prime (1111447).

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 (12).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2430 + ... + 2850.

2^1111440 is an apocalyptic number.

1111440 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 1111440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1883808).

1111440 is an abundant number, since it is smaller than the sum of its proper divisors (2656176).

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

1111440 is a wasteful number, since it uses less digits than its factorization.

1111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1111440 is about 1054.2485475446. The cubic root of 1111440 is about 103.5846351994.

Adding to 1111440 its reverse (441111), we get a palindrome (1552551).

It can be divided in two parts, 1111 and 440, that added together give a palindrome (1551).

The spelling of 1111440 in words is "one million, one hundred eleven thousand, four hundred forty".