40018889993 has 2 divisors, whose sum is σ = 40018889994. Its totient is φ = 40018889992.

The previous prime is 40018889987. The next prime is 40018890017. The reversal of 40018889993 is 39998881004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29696939584 + 10321950409 = 172328^2 + 101597^2 .

It is a cyclic number.

It is not a de Polignac number, because 40018889993 - 2¹⁰ = 40018888969 is a prime.

It is not a weakly prime, because it can be changed into another prime (40018889893) 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 as a sum of consecutive naturals, namely, 20009444996 + 20009444997.

It is an arithmetic number, because the mean of its divisors is an integer number (20009444997).

Almost surely, 2^40018889993 is an apocalyptic number.

It is an amenable number.

40018889993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40018889993 is an equidigital number, since it uses as much as digits as its factorization.

40018889993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 59.

The spelling of 40018889993 in words is "forty billion, eighteen million, eight hundred eighty-nine thousand, nine hundred ninety-three".