39905243109 has 16 divisors (see below), whose sum is σ = 59145681600. Its totient is φ = 26591434128.

The previous prime is 39905243039. The next prime is 39905243113. The reversal of 39905243109 is 90134250993.

39905243109 is a `hidden beast` number, since 3 + 9 + 90 + 524 + 31 + 0 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-39905243109 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39905243159) 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 in 15 ways as a sum of consecutive naturals, for example, 274179 + ... + 393680.

It is an arithmetic number, because the mean of its divisors is an integer number (3696605100).

Almost surely, 2^39905243109 is an apocalyptic number.

It is an amenable number.

39905243109 is a deficient number, since it is larger than the sum of its proper divisors (19240438491).

39905243109 is a wasteful number, since it uses less digits than its factorization.

39905243109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670081 (or 670075 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The spelling of 39905243109 in words is "thirty-nine billion, nine hundred five million, two hundred forty-three thousand, one hundred nine".