1240813856826 has 72 divisors (see below), whose sum is σ = 2779287923412. Its totient is φ = 400069929600.

The previous prime is 1240813856767. The next prime is 1240813856827. The reversal of 1240813856826 is 6286583180421.

1240813856826 is a `hidden beast` number, since 1 + 2 + 40 + 8 + 1 + 38 + 568 + 2 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1057402946601 + 183410910225 = 1028301^2 + 428265^2 .

It is not an unprimeable number, because it can be changed into a prime (1240813856827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 38402710 + ... + 38435006.

Almost surely, 2^{1240813856826} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1240813856826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1389643961706).

1240813856826 is an abundant number, since it is smaller than the sum of its proper divisors (1538474066586).

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

1240813856826 is a wasteful number, since it uses less digits than its factorization.

1240813856826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34588 (or 34554 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 1240813856826 in words is "one trillion, two hundred forty billion, eight hundred thirteen million, eight hundred fifty-six thousand, eight hundred twenty-six".