1240401440 has 96 divisors (see below), whose sum is σ = 3008565504. Its totient is φ = 483051520.

The previous prime is 1240401439. The next prime is 1240401457. The reversal of 1240401440 is 441040421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2112827 + ... + 2113413.

It is an arithmetic number, because the mean of its divisors is an integer number (31339224).

Almost surely, 2^1240401440 is an apocalyptic number.

1240401440 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 1240401440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1504282752).

1240401440 is an abundant number, since it is smaller than the sum of its proper divisors (1768164064).

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

1240401440 is a wasteful number, since it uses less digits than its factorization.

1240401440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1240401440 is about 35219.3333270237. Note that the first 4 decimals coincide. The cubic root of 1240401440 is about 1074.4529944677.

Adding to 1240401440 its reverse (441040421), we get a palindrome (1681441861).

The spelling of 1240401440 in words is "one billion, two hundred forty million, four hundred one thousand, four hundred forty".