1181440 has 72 divisors (see below), whose sum is σ = 3090528. Its totient is φ = 430080.

The previous prime is 1181437. The next prime is 1181443. The reversal of 1181440 is 441811.

It is an interprime number because it is at equal distance from previous prime (1181437) and next prime (1181443).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16605 + ... + 16675.

It is an arithmetic number, because the mean of its divisors is an integer number (42924).

2^1181440 is an apocalyptic number.

1181440 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 1181440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545264).

1181440 is an abundant number, since it is smaller than the sum of its proper divisors (1909088).

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

1181440 is an equidigital number, since it uses as much as digits as its factorization.

1181440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 1181440 is about 1086.9406607538. The cubic root of 1181440 is about 105.7151483459.

The spelling of 1181440 in words is "one million, one hundred eighty-one thousand, four hundred forty".