999940001199989 has 2 divisors, whose sum is σ = 999940001199990. Its totient is φ = 999940001199988.

The previous prime is 999940001199983. The next prime is 999940001200003. The reversal of 999940001199989 is 989991100049999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 973278702682225 + 26661298517764 = 31197415^2 + 5163458^2 .

It is an emirp because it is prime and its reverse (989991100049999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999940001199989 - 2⁴⁴ = 982347815155573 is a prime.

It is a super-4 number, since 4×999940001199989⁴ (a number of 61 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999940001199989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999940001199983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499970000599994 + 499970000599995.

It is an arithmetic number, because the mean of its divisors is an integer number (499970000599995).

Almost surely, 2^{999940001199989} is an apocalyptic number.

It is an amenable number.

999940001199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

999940001199989 is an equidigital number, since it uses as much as digits as its factorization.

999940001199989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1377495072, while the sum is 86.

The spelling of 999940001199989 in words is "nine hundred ninety-nine trillion, nine hundred forty billion, one million, one hundred ninety-nine thousand, nine hundred eighty-nine".