1243020234040 has 128 divisors (see below), whose sum is σ = 3106129420800. Its totient is φ = 444826851840.

The previous prime is 1243020234017. The next prime is 1243020234091. The reversal of 1243020234040 is 404320203421.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1243020233996 and 1243020234014.

It is a congruent number.

It is an unprimeable number.

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, 1892959 + ... + 2463601.

It is an arithmetic number, because the mean of its divisors is an integer number (24266636100).

Almost surely, 2^{1243020234040} is an apocalyptic number.

1243020234040 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 1243020234040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553064710400).

1243020234040 is an abundant number, since it is smaller than the sum of its proper divisors (1863109186760).

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

1243020234040 is a wasteful number, since it uses less digits than its factorization.

1243020234040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570797 (or 570793 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 1243020234040 its reverse (404320203421), we get a palindrome (1647340437461).

The spelling of 1243020234040 in words is "one trillion, two hundred forty-three billion, twenty million, two hundred thirty-four thousand, forty".