1242440040 has 128 divisors (see below), whose sum is σ = 3875558400. Its totient is φ = 318259200.

The previous prime is 1242440033. The next prime is 1242440051. The reversal of 1242440040 is 400442421.

It is a junction number, because it is equal to n+sod(n) for n = 1242439989 and 1242440016.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 775240 + ... + 776840.

It is an arithmetic number, because the mean of its divisors is an integer number (30277800).

Almost surely, 2^1242440040 is an apocalyptic number.

1242440040 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 1242440040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1937779200).

1242440040 is an abundant number, since it is smaller than the sum of its proper divisors (2633118360).

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

1242440040 is a wasteful number, since it uses less digits than its factorization.

1242440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867 (or 1863 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 1242440040 is about 35248.2629359235. The cubic root of 1242440040 is about 1075.0412935283.

Adding to 1242440040 its reverse (400442421), we get a palindrome (1642882461).

The spelling of 1242440040 in words is "one billion, two hundred forty-two million, four hundred forty thousand, forty".