1240203440 has 80 divisors (see below), whose sum is σ = 3299842368. Its totient is φ = 424639488.

The previous prime is 1240203427. The next prime is 1240203449. The reversal of 1240203440 is 443020421.

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 (20).

It is not an unprimeable number, because it can be changed into a prime (1240203449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768074 + ... + 769686.

Almost surely, 2^1240203440 is an apocalyptic number.

1240203440 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 1240203440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1649921184).

1240203440 is an abundant number, since it is smaller than the sum of its proper divisors (2059638928).

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

1240203440 is a wasteful number, since it uses less digits than its factorization.

1240203440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006 (or 3000 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1240203440 is about 35216.5222587353. The cubic root of 1240203440 is about 1074.3958213067.

Adding to 1240203440 its reverse (443020421), we get a palindrome (1683223861).

The spelling of 1240203440 in words is "one billion, two hundred forty million, two hundred three thousand, four hundred forty".