1243402240 has 104 divisors (see below), whose sum is σ = 3016581480. Its totient is φ = 491913216.

The previous prime is 1243402229. The next prime is 1243402243. The reversal of 1243402240 is 422043421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 40144896 + 1203257344 = 6336^2 + 34688^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243402243) 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, 2232042 + ... + 2232598.

Almost surely, 2^1243402240 is an apocalyptic number.

1243402240 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 1243402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1508290740).

1243402240 is an abundant number, since it is smaller than the sum of its proper divisors (1773179240).

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

1243402240 is an equidigital number, since it uses as much as digits as its factorization.

1243402240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 1243402240 is about 35261.9091939163. The cubic root of 1243402240 is about 1075.3187416102.

Adding to 1243402240 its reverse (422043421), we get a palindrome (1665445661).

The spelling of 1243402240 in words is "one billion, two hundred forty-three million, four hundred two thousand, two hundred forty".