1240443126 has 64 divisors (see below), whose sum is σ = 2975797440. Its totient is φ = 380747520.

The previous prime is 1240443121. The next prime is 1240443143. The reversal of 1240443126 is 6213440421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1240443126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240443121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 321706 + ... + 325538.

It is an arithmetic number, because the mean of its divisors is an integer number (46496835).

Almost surely, 2^1240443126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1240443126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487898720).

1240443126 is an abundant number, since it is smaller than the sum of its proper divisors (1735354314).

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

1240443126 is a wasteful number, since it uses less digits than its factorization.

1240443126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318 (or 4312 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1240443126 is about 35219.9251276887. The cubic root of 1240443126 is about 1074.4650306640.

Adding to 1240443126 its reverse (6213440421), we get a palindrome (7453883547).

The spelling of 1240443126 in words is "one billion, two hundred forty million, four hundred forty-three thousand, one hundred twenty-six".