1243990012723 has 2 divisors, whose sum is σ = 1243990012724. Its totient is φ = 1243990012722.

The previous prime is 1243990012711. The next prime is 1243990012813. The reversal of 1243990012723 is 3272100993421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243990012723 - 2²⁵ = 1243956458291 is a prime.

It is a super-3 number, since 3×1243990012723³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1243990012723.

It is not a weakly prime, because it can be changed into another prime (1243990012423) 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 as a sum of consecutive naturals, namely, 621995006361 + 621995006362.

It is an arithmetic number, because the mean of its divisors is an integer number (621995006362).

Almost surely, 2^{1243990012723} is an apocalyptic number.

1243990012723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243990012723 is an equidigital number, since it uses as much as digits as its factorization.

1243990012723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 1243990012723 in words is "one trillion, two hundred forty-three billion, nine hundred ninety million, twelve thousand, seven hundred twenty-three".