40208868989 has 2 divisors, whose sum is σ = 40208868990. Its totient is φ = 40208868988.

The previous prime is 40208868943. The next prime is 40208869003. The reversal of 40208868989 is 98986880204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31120488100 + 9088380889 = 176410^2 + 95333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40208868989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40208861989) 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, 20104434494 + 20104434495.

It is an arithmetic number, because the mean of its divisors is an integer number (20104434495).

Almost surely, 2^40208868989 is an apocalyptic number.

It is an amenable number.

40208868989 is a deficient number, since it is larger than the sum of its proper divisors (1).

40208868989 is an equidigital number, since it uses as much as digits as its factorization.

40208868989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15925248, while the sum is 62.

The spelling of 40208868989 in words is "forty billion, two hundred eight million, eight hundred sixty-eight thousand, nine hundred eighty-nine".