40989638489 has 2 divisors, whose sum is σ = 40989638490. Its totient is φ = 40989638488.

The previous prime is 40989638477. The next prime is 40989638509. The reversal of 40989638489 is 98483698904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39733644889 + 1255993600 = 199333^2 + 35440^2 .

It is a cyclic number.

It is not a de Polignac number, because 40989638489 - 2⁸ = 40989638233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40989631489) 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, 20494819244 + 20494819245.

It is an arithmetic number, because the mean of its divisors is an integer number (20494819245).

Almost surely, 2^40989638489 is an apocalyptic number.

It is an amenable number.

40989638489 is a deficient number, since it is larger than the sum of its proper divisors (1).

40989638489 is an equidigital number, since it uses as much as digits as its factorization.

40989638489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107495424, while the sum is 68.

The spelling of 40989638489 in words is "forty billion, nine hundred eighty-nine million, six hundred thirty-eight thousand, four hundred eighty-nine".