1240621854789 has 16 divisors (see below), whose sum is σ = 1768182159744. Its totient is φ = 771825542400.

The previous prime is 1240621854781. The next prime is 1240621854809. The reversal of 1240621854789 is 9874581260421.

It is not a de Polignac number, because 1240621854789 - 2³ = 1240621854781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240621854781) 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 15 ways as a sum of consecutive naturals, for example, 219265792 + ... + 219271449.

It is an arithmetic number, because the mean of its divisors is an integer number (110511384984).

Almost surely, 2^{1240621854789} is an apocalyptic number.

It is an amenable number.

1240621854789 is a deficient number, since it is larger than the sum of its proper divisors (527560304955).

1240621854789 is a wasteful number, since it uses less digits than its factorization.

1240621854789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438537308.

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 1240621854789 in words is "one trillion, two hundred forty billion, six hundred twenty-one million, eight hundred fifty-four thousand, seven hundred eighty-nine".