1100240 has 40 divisors (see below), whose sum is σ = 2711880. Its totient is φ = 413696.

The previous prime is 1100219. The next prime is 1100243. The reversal of 1100240 is 420011.

It can be written as a sum of positive squares in 4 ways, for example, as 440896 + 659344 = 664^2 + 812^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100243) 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, 956 + ... + 1764.

It is an arithmetic number, because the mean of its divisors is an integer number (67797).

2^1100240 is an apocalyptic number.

1100240 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 1100240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1355940).

1100240 is an abundant number, since it is smaller than the sum of its proper divisors (1611640).

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

1100240 is a wasteful number, since it uses less digits than its factorization.

1100240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1100240 is about 1048.9232574407. The cubic root of 1100240 is about 103.2355184915.

Adding to 1100240 its reverse (420011), we get a palindrome (1520251).

The spelling of 1100240 in words is "one million, one hundred thousand, two hundred forty".