1240240 has 40 divisors (see below), whose sum is σ = 2968560. Its totient is φ = 481536.

The previous prime is 1240231. The next prime is 1240241. The reversal of 1240240 is 420421.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1240240.

It is not an unprimeable number, because it can be changed into a prime (1240241) 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, 2751 + ... + 3169.

It is an arithmetic number, because the mean of its divisors is an integer number (74214).

2^1240240 is an apocalyptic number.

1240240 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 1240240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1484280).

1240240 is an abundant number, since it is smaller than the sum of its proper divisors (1728320).

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

1240240 is a wasteful number, since it uses less digits than its factorization.

1240240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 1240240 is about 1113.6606305334. The cubic root of 1240240 is about 107.4406378587.

Adding to 1240240 its reverse (420421), we get a palindrome (1660661).

The spelling of 1240240 in words is "one million, two hundred forty thousand, two hundred forty".